<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0004-0614</journal-id>
<journal-title><![CDATA[Archivos Españoles de Urología (Ed. impresa)]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Esp. Urol.]]></abbrev-journal-title>
<issn>0004-0614</issn>
<publisher>
<publisher-name><![CDATA[INIESTARES, S.A.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0004-06142010000400002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Anatomía quirúrgica de la prostatectomía radical: fascias y esfínteres urinarios]]></article-title>
<article-title xml:lang="en"><![CDATA[Surgical anatomy of radical prostatectomy: Periprostatic fascial anatomy and overview of the urinary sphincters]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Secin]]></surname>
<given-names><![CDATA[Fernando P.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bianco]]></surname>
<given-names><![CDATA[Fernando J.]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A">
<institution><![CDATA[,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2010</year>
</pub-date>
<volume>63</volume>
<numero>4</numero>
<fpage>255</fpage>
<lpage>266</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0004-06142010000400002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0004-06142010000400002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0004-06142010000400002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los avances en la comprensión de la anatomía de la próstata y de la pelvis en los años recientes han significado una contribución sustancial para mejorar la técnica quirúrgica en el tratamiento del cáncer de próstata (CaP), con la preservación potencial de las estructuras anatómicas responsables de las funciones eréctil y urinaria postoperatoria. El conocimiento de estas estructuras anatómicas es la llave para conseguir una extirpación completa de la próstata y las vesículas seminales preservando a la vez la mejor calidad de vida posible. Revisamos la literatura sobre la anatomía de la próstata y la pelvis y hacemos una puesta al día de la anatomía quirúrgica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Advances in the understanding of prostate and pelvic anatomy in recent years made a substantial contribution to improve the surgical technique for the treatment of prostate cancer (PC) with the potential preservation of anatomic structures responsible for erectile and urinary function postoperatively. Knowledge of these anatomic structures is key to achieve a complete removal of the prostate and seminal vesicles while preserving the best possible quality of life. The literature on prostate and pelvic anatomy has been reviewed and an updated notion of the surgical anatomy is herein provided.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cáncer de próstata]]></kwd>
<kwd lng="es"><![CDATA[Anatomía]]></kwd>
<kwd lng="es"><![CDATA[Prostatectomía radical]]></kwd>
<kwd lng="en"><![CDATA[Prostate cancer]]></kwd>
<kwd lng="en"><![CDATA[Anatomy]]></kwd>
<kwd lng="en"><![CDATA[Radical prostatectomy]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><font face="Verdana" size="2"><b><a name="top"></a>ART&Iacute;CULO ESPECIAL</b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="4"><b>Anatom&iacute;a quir&uacute;rgica de la prostatectom&iacute;a radical: fascias y esf&iacute;nteres urinarios</b></font></p>     <p><font face="Verdana" size="4"><b>Surgical anatomy of radical prostatectomy: Periprostatic fascial anatomy and overview of the urinary sphincters</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Fernando P. Secin y Fernando J. Bianco</b></font></p>     <p><font face="Verdana" size="2">Urology Section. CEMIC. Buenos Aires. Argentina.    <br>Columbia University Division of Urology. Mt. Sinai Medical Center. Miami Beach. USA.</font></p>     <p><font face="Verdana" size="2"><a href="#back">Dirección para correspondencia</a></font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1">     <p><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p><font face="Verdana" size="2">Los avances en la comprensi&oacute;n de la anatom&iacute;a de la pr&oacute;stata y de la pelvis en los a&ntilde;os recientes han significado una contribuci&oacute;n sustancial para mejorar la t&eacute;cnica quir&uacute;rgica en el tratamiento del c&aacute;ncer de pr&oacute;stata (CaP), con la preservaci&oacute;n potencial de las estructuras anat&oacute;micas responsables de las funciones er&eacute;ctil y urinaria postoperatoria. El conocimiento de estas estructuras anat&oacute;micas es la llave para conseguir una extirpaci&oacute;n completa de la pr&oacute;stata y las ves&iacute;culas seminales preservando a la vez la mejor calidad de vida posible. Revisamos la literatura sobre la anatom&iacute;a de la pr&oacute;stata y la pelvis y hacemos una puesta al d&iacute;a de la anatom&iacute;a quir&uacute;rgica.</font></p>     <p><font face="Verdana" size="2"><b>Palabras clave:</b> C&aacute;ncer de pr&oacute;stata. Anatom&iacute;a. Prostatectom&iacute;a radical.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><b>SUMMARY</b></font></p>     <p><font face="Verdana" size="2">Advances in the understanding of prostate and pelvic anatomy in recent years made a substantial contribution to improve the surgical technique for the treatment of prostate cancer (PC) with the potential preservation of anatomic structures responsible for erectile and urinary function postoperatively. Knowledge of these anatomic structures is key to achieve a complete removal of the prostate and seminal vesicles while preserving the best possible quality of life. The literature on prostate and pelvic anatomy has been reviewed and an updated notion of the surgical anatomy is herein provided.</font></p>     <p><font face="Verdana" size="2"><b>Key words:</b> Prostate cancer. Anatomy. Radical prostatectomy.</font></p> <hr size="1">     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Introducci&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">"En general, los cirujanos que conocen la anatom&iacute;a protegen al paciente por virtud de menos sangrado, mejores m&aacute;rgenes de resecci&oacute;n y una mayor preservaci&oacute;n funcional" <i>Robert P. Myers</i> (1).</font></p>     <p><font face="Verdana" size="2">La Prostatectom&iacute;a Radical (PR) es la &uacute;nica modalidad de tratamiento primario del C&aacute;ncer de Pr&oacute;stata (CaP) localizado que ha demostrado su eficacia frente a la vigilancia expectante en un ensayo cl&iacute;nico aleatorizado (2). Los avances en el conocimiento de la anatom&iacute;a prost&aacute;tica y p&eacute;lvica en a&ntilde;os recientes han contribuido a mejor&iacute;as de la t&eacute;cnica quir&uacute;rgica que se han traducido en muy buenos resultados de supervivencia a largo plazo con resultados funcionales razonablemente buenos, aunque lejos de ser &oacute;ptimos, independientemente de la t&eacute;cnica quir&uacute;rgica elegida, es decir prostatectom&iacute;a radical abierta, (3-7) laparosc&oacute;pica (8-10) o rob&oacute;tica (11-14).</font></p>     <p><font face="Verdana" size="2">Un aspecto crucial para entender la compleja anatom&iacute;a de la pelvis masculina es la significativa variaci&oacute;n individual. Algunas pelvis son anchas, haciendo la pr&oacute;stata f&aacute;cilmente accesible, mientras que otras son profundas y estrechas, complicando el acceso, particularmente en el momento de realizar una cirug&iacute;a con preservaci&oacute;n nerviosa o una reconstrucci&oacute;n uretrovesical estanca (15). Las estructuras neurovasculares que rodean la pr&oacute;stata tambi&eacute;n pueden variar de un paciente a otro, y el cirujano debe estar preparado para entender estas variaciones y adaptar la t&eacute;cnica quir&uacute;rgica a los hallazgos intraoperatorios (16-18).</font></p>     <p><font face="Verdana" size="2">El objetivo de este art&iacute;culo es ofrecer una revisi&oacute;n sistem&aacute;tica actualizada de la literatura sobre la anatom&iacute;a periprost&aacute;tica y de las estructuras consideradas cruciales para conseguir los cinco objetivos principales de una prostatectom&iacute;a radical ideal: extirpaci&oacute;n completa del c&aacute;ncer con m&aacute;rgenes quir&uacute;rgicos negativos, preservaci&oacute;n de la continencia urinaria, recuperaci&oacute;n temprana de la funci&oacute;n er&eacute;ctil, m&iacute;nimo sangrado y ausencia de complicaciones perioperatorias. Sin embargo, en algunas ocasiones, conseguir uno de los objetivos va a afectar a la consecuci&oacute;n de uno o m&aacute;s de los otros y viceversa. Por ejemplo, los pacientes con tumores localmente avanzados van a necesitar la resecci&oacute;n de tejido periprost&aacute;tico adicional dificultando la recuperaci&oacute;n de la funci&oacute;n er&eacute;ctil, y a veces de la continencia urinaria. Por el contrario, una excesiva obsesi&oacute;n con la preservaci&oacute;n de los nervios cavernosos puede poner en peligro la extirpaci&oacute;n completa del c&aacute;ncer, con la posibilidad de dejar tejido canceroso. Adicionalmente, el cirujano puede tener que conceder un sangrado adicional para realizar una preservaci&oacute;n adecuada de los nervios cavernosos.</font></p>     <p><font face="Verdana" size="2">El presente art&iacute;culo esta primariamente enfocado al conocimiento de la anatom&iacute;a de las fascias periprost&aacute;ticas y de los diferentes tipos de disecci&oacute;n de las bandeletas neurovasculares en relaci&oacute;n con la localizaci&oacute;n y distribuci&oacute;n  de los nervios cavernosos. Damos, por lo tanto, una visi&oacute;n general de la configuraci&oacute;n del esf&iacute;nter urinario y sus estructuras de soporte.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Material y M&eacute;todos</b></font></p>     <p><font face="Verdana" size="2">Realizamos una b&uacute;squeda bibliogr&aacute;fica en ingl&eacute;s utilizando la base de datos de la Biblioteca Nacional de Medicina con las siguientes palabras clave: prostatectom&iacute;a radical, anatom&iacute;a, bandeleta neurovascular, nervios cavernosos, fascia, fascia de Denonvilliers, anatom&iacute;a de la pelvis, m&uacute;sculo rectouretral, puboperineal, elevador del ano, y esf&iacute;nter urinario. Se aplic&oacute; una estrategia de texto libre sin l&iacute;mite de a&ntilde;o de publicaci&oacute;n. Se consultaron tambi&eacute;n los libros de texto de anatom&iacute;a.</font></p>     <p><font face="Verdana" size="2">Las listas de referencias de los art&iacute;culos obtenidos fueron revisadas buscando art&iacute;culos relevantes adicionales. Se seleccionaron 104 citas bibliogr&aacute;ficas para la presente revisi&oacute;n bas&aacute;ndose en su relevancia, tama&ntilde;o del estudio, dise&ntilde;o y contribuci&oacute;n global al campo.</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b>Resultados y discusi&oacute;n</b></font></p>     <p><font face="Verdana" size="2"><b><i>Tipo y extensi&oacute;n de la disecci&oacute;n de los nervios cavernosos y las bandeletas neurovasculars (BNV)</i></b></font></p>     <p><font face="Verdana" size="2">Aunque la descripci&oacute;n anat&oacute;mica de los nervios responsables de la funci&oacute;n er&eacute;ctil se remonta hasta el siglo XIX (19), Walsh y colaboradores fueron los primeros en introducir el t&eacute;rmino bandeleta como referencia macrosc&oacute;pica a utilizar intraoperatoriamente para identificar y preservar los nervios cavernosos (NC). Sin embargo, desde entonces los t&eacute;rminos bandeletas neurovasculares y nervios cavernosos han sido usados en forma indistinta. M&aacute;s recientemente, Costello y colaboradores enfatizaron que no era apropiado continuar con el intercambio de esos t&eacute;rminos porque las bandeletas contienen no s&oacute;lo los nervios cavernosos sino tambi&eacute;n parte del aporte neurovascular del recto, m&uacute;sculo elevador del ano, uretra, pr&oacute;stata y ves&iacute;culas seminales (16).</font></p>     <p><font face="Verdana" size="2">Las bandeletas neurovasculares se componen tanto de fibras simp&aacute;ticas como parasimp&aacute;ticas que vienen del plexo p&eacute;lvico (plexo hipog&aacute;strico inferior). Mientras que las primeras son responsables mayormente de la eyaculaci&oacute;n y la continencia urinaria, las segundas contribuyen m&aacute;s a la funci&oacute;n er&eacute;ctil (21). El plexo p&eacute;lvico est&aacute; situado bilateralmente dentro del tejido fibroadiposo sobre la superficie lateral del recto a la altura de tercio distal de la vejiga urinaria, despleg&aacute;ndose en forma de abanico con una separaci&oacute;n de hasta tres cent&iacute;metros entre los nervios m&aacute;s anteriores y los m&aacute;s posteriores. Su longitud es aproximadamente 4 cm. Se extiende ventralmente desde el sacro hasta el fondo de saco rectovesical (21-23). Las fibras localizadas en el aspecto m&aacute;s anterior del plexo p&eacute;lvico est&aacute;n a una distancia de s&oacute;lo mil&iacute;metros de la superficie lateral de las ves&iacute;culas seminales, el cuello vesical y la base prost&aacute;tica (24, 25). Aunque es posible la lesi&oacute;n potencial de los NC en este &aacute;rea, las fibras parasimp&aacute;ticas, responsables &uacute;ltimas de la funci&oacute;n er&eacute;ctil, se unen a la bandeleta neurovascular dos o tres cent&iacute;metros por debajo de la uni&oacute;n del cuello vesical y la pr&oacute;stata en forma de ramillete (26, 27). Los nervios convergen en el nivel medio de la pr&oacute;stata y luego vuelven a separarse cuando se acercan al pico prost&aacute;tico (16, 28, 29).</font></p>     <p><font face="Verdana" size="2">No obstante, algunos autores describen que el &aacute;rea cerca del ped&iacute;culo prost&aacute;tico y las ves&iacute;culas seminales es la localizaci&oacute;n donde con mayor frecuencia se producen las lesiones de los NC (21, 25). Otros incluso proponen preservar las puntas de las ves&iacute;culas seminales en pacientes altamente seleccionados, por tener muy bajo riesgo de progresi&oacute;n, como medida para obtener mejores resultados de funci&oacute;n er&eacute;ctil en el posoperatorio (30). Las puntas est&aacute;n en realidad contenidas en bolsillos fasciales; la bandeleta neurovascular se aproximan a la superficie lateral de la ves&iacute;culas seminales justo distal a sus puntas.</font></p>     <p><font face="Verdana" size="2">Los estudios han demostrado una gran variaci&oacute;n interindividual del n&uacute;mero y distribuci&oacute;n de las fibras nerviosas que rodean la pr&oacute;stata (31-33). El grueso de las estructuras neurovasculares tiende a localizarse posterolateralmente en la mayor&iacute;a de los pacientes, pero puede que no siempre formen una bandeleta. Una proporci&oacute;n significativa de fibras puede estar lejos de los troncos nerviosos principales, a lo largo de los aspectos lateral y posterior de la pr&oacute;stata (34, 35). Persiste la controversia en la literatura sobre el papel de la preservaci&oacute;n de las bandeletas neurovasculares en la recuperaci&oacute;n de la continencia urinaria (36-40) (ver abajo).</font></p>     <p><font face="Verdana" size="2">Una vez descrita la localizaci&oacute;n de los nervios cavernosos en relaci&oacute;n con las bandeletas neurovasculares y el area periprost&aacute;tica, comprender la localizaci&oacute;n y distribuci&oacute;n de las fascias alrededor de la pr&oacute;stata y su relaci&oacute;n con las bandeletas neurovasculares se convierte en la clave para conseguir el grado deseado de disecci&oacute;n de los nervios cavernosos. Las siguientes fascias son referencias quir&uacute;rgicas que ayudan a determinar las capas que deben incidirse para extirpar o preservar diferentes cantidades de tejido de los nervios cavernosos durante la prostatectom&iacute;a radical (41-44). Hay 4 fascias principales distintas rodeando la pr&oacute;stata y las bandeletas neurovasculares: (17) (<a href="#f1">Figura 1</a>)</font></p>     <blockquote> 	    <p><font face="Verdana" size="2"><b><i>a.</i></b> Fascia endop&eacute;lvica, (fascia del elevador del ano lateral al arco tend&iacute;neo de la pelvis)</font></p> 	    <p><font face="Verdana" size="2"><b><i>b.</i></b> Fascia del elevador del ano (fascia p&eacute;lvica lateral, originalmente descrita como un remanente de la fascia del elevador del ano sobre la superficie lateral de la pr&oacute;stata despu&eacute;s de incidir la fascia endop&eacute;lvica lateral a la fascia del arco tend&iacute;neo de la pelvis)</font></p> 	    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b><i>c.</i></b> Fascia prost&aacute;tica</font></p> 	    <p><font face="Verdana" size="2"><b><i>d.</i></b> Fascia de Denonvilliers (fascia prostato seminovesicular)</font></p> </blockquote>     <p>&nbsp;</p>     <p><a name="f1"></a></p>     <p align="center"><img src="/img/revistas/urol/v63n4/02f01.jpg"></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b><i>a. Fascia endop&eacute;lvica</i></b></font></p>     <p><font face="Verdana" size="2">La fascia endop&eacute;lvica tiene dos componentes: parietal y visceral. La capa parietal (fascia endop&eacute;lvica) cubre el elevador del ano lateralmente al arco tend&iacute;neo de la pelvis (45). Fascia visceral es cualquier fascia que cubre una v&iacute;scera, a saber la fascia medial al arco tend&iacute;neo de la pelvis. Esta fascia cubre el musculo liso longitudinal vesical que forma una capa diferenciada cubriendo enteramente la superficie anterior de la pr&oacute;stata subyacente.</font></p>     <p><font face="Verdana" size="2">De acuerdo con Villers y cols. (45) la fascia p&eacute;lvica visceral est&aacute; compuesta por el tejido conectivo fibroadiposo y el aporte neurovascular localizados debajo de la fascia parietal. Cubre y se adhiere a todas las superficies de vejiga, pr&oacute;stata, ves&iacute;culas seminales, recto y vasculatura pudenda. Su grosor var&iacute;a en funci&oacute;n de la cantidad de tejido adiposo, vasos y nervios que contiene. El arco tend&iacute;neo de la pelvis representa un engrosamiento de los componentes parietal y visceral de la fascia endop&eacute;lvica que se extiende desde los ligamentos pubovesicales (puboprost&aacute;ticos) hasta la espina isqui&aacute;tica bilateralmente (45) (ver abajo).</font></p>     <p><font face="Verdana" size="2">Sin embargo, Myers y cols. propusieron una definici&oacute;n m&aacute;s simple de la fascia (endo)p&eacute;lvica, una definici&oacute;n que se ajusta a la Terminolog&iacute;a Anat&oacute;mica de 1998 y a las N&oacute;minas Anat&oacute;micas precedentes. La fascia lateral al arco tend&iacute;neo fascial se denomina fascia (endo)p&eacute;lvica parietal, y la fascia medial, al extenderse sobre la porci&oacute;n anterior de la vejiga y la pr&oacute;stata subyacente, forma la fascia (endo)p&eacute;lvica visceral (1, 46).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Takenaka y cols. (17) han ilustrado elegantemente en estudios en cad&aacute;veres lo que los cirujanos pioneros de cirug&iacute;a abierta y laparoscopistas han predicado tradicionalmente sobre la localizaci&oacute;n correcta donde incidir la fascia medial al arco tend&iacute;neo de la pelvis para acceder al aspecto lateral de la pr&oacute;stata sin denudar las fibras del elevador del ano (3, 42). Como muestra la <a href="#f1">Figura 1</a> (&aacute;rea sombreada), en algunas ocasiones, la parte de la fascia endop&eacute;lvica que tapiza la pr&oacute;stata se fusiona (coalesencia) con la que descansa sobre la fascia del elevador del ano en el punto de reflexi&oacute;n m&aacute;s profundo. Es necesario separar tal fusi&oacute;n de las capas para llegar al punto m&aacute;s declive del fondo de saco y hacer una incisi&oacute;n adecuada de la fascia endop&eacute;lvica. La contratracci&oacute;n en la pr&oacute;stata facilita la identificaci&oacute;n y disecci&oacute;n del contorno de la reflexi&oacute;n fascial donde la fascia endop&eacute;lvica forma un fondo de saco entre la fascia del elevador del ano lateralmente y la fascia prost&aacute;tica medialmente (17). Es m&aacute;s f&aacute;cil identificar e incidir correctamente este fondo de saco cuando la disecci&oacute;n se inicia cerca de la base prost&aacute;tica, (en oposici&oacute;n a la disecci&oacute;n cerca del &aacute;pex) donde la fascia endop&eacute;lvica parece ser m&aacute;s fina y el espacio entre el elevador del ano y la fascia prost&aacute;tica es m&aacute;s amplio. Dicho lo anterior, no todas las pr&oacute;statas tienen fascia prost&aacute;tica, algunas s&oacute;lo tienen su pseudoc&aacute;psula, y este tipo de apertura de la fascia pelviana medial al arco tend&iacute;neo de la pelvis tiene el riesgo de incidirla pudiendo da&ntilde;ar la superficie glandular. <i>(Myers, en prensa)</i></font></p>     <p><font face="Verdana" size="2"><b><i>Fascia del elevador del ano</i></b></font></p>     <p><font face="Verdana" size="2">Al tratarse de una fascia periprost&aacute;tica m&aacute;s externa, la fascia del elevador del ano (Fascia p&eacute;lvica lateral) cubre el m&uacute;sculo elevador del ano subyacente distribuido lateralmente y, por lo tanto, forma el l&iacute;mite lateral del espacio axial triangular ocupado por el grueso de los nervios cavernosos y vasos, y cantidades variables de tejido adiposo. Los l&iacute;mites medial y posterior de este tri&aacute;ngulo est&aacute;n formados por la pseudoc&aacute;psula prost&aacute;tica (cubierta o no por la fascia prost&aacute;tica) y la fascia de Denonvilliers, respectivamente (16, 17, 47-49). La fascia del elevador del ano se extiende posteriormente sobre las fibras musculares y continua sobre el aspecto lateral del recto formando la as&iacute; llamada fascia pararectal (16, 50, 51) que se fusiona posteriormente con la fascia presacra (48) (<a href="#f1">Figura 1</a>). Como se ha dicho anteriormente, la fascia del elevador del ano est&aacute; adherida de forma variable, aunque no completamente fundida, a la fascia prost&aacute;tica, as&iacute;, pueden separarse generando un espacio entre ellas, donde la fascia endop&eacute;lvica se refleja formando un fondo de saco. Abrir la fascia endop&eacute;lvica medialmente a este fondo de saco y el arco tend&iacute;neo fascial de la pelvis dejar&aacute; las fibras del elevador del ano cubiertas por su propia fascia. Ocasionalmente la fascia del elevador puede estar adherida a la uni&oacute;n uretroprost&aacute;tica (27).</font></p>     <p><font face="Verdana" size="2"><b><i>Fascia Prost&aacute;tica</i></b></font></p>     <p><font face="Verdana" size="2">Por debajo de la fina fascia del elevador del ano, m&aacute;s externa, la pr&oacute;stata est&aacute; cubierta de forma variable por una segunda fascia periprost&aacute;tica m&aacute;s interna, la fascia prost&aacute;tica. La fascia prost&aacute;tica se fusiona anteriormente con el estroma fibromuscular anterior, quedando en &iacute;ntimo contacto con la pseudoc&aacute;psula prost&aacute;tica m&aacute;s lateralmente. A veces, la fascia prost&aacute;tica est&aacute; ausente <i>(Myers, en prensa)</i></font></p>     <p><font face="Verdana" size="2"><b><i>Fascia de Denonvilliers</i></b></font></p>     <p><font face="Verdana" size="2">La fascia de Denonvilliers (fascia prostato-semino-vesicular) (44, 52) est&aacute; compuesta macrosc&oacute;picamente por una capa &uacute;nica blanquecina de tejido que se extiende caudalmente sobre el aspecto posterior de las ves&iacute;culas seminales y la pr&oacute;stata hasta unirse en la l&iacute;nea media con el tend&oacute;n central del perin&eacute; (44) (<a href="#f2">Figura 2</a>). Aunque macrosc&oacute;picamente es una sola capa, en la mayor&iacute;a de los casos, aunque no siempre, la fascia de Denonvilliers est&aacute; compuesta histol&oacute;gicamente de 2 capas distinguibles al microscopio. Algunos autores la describen como formada por m&uacute;ltiples capas, particularmente en su porci&oacute;n m&aacute;s distal (44, 49, 53). La Fascia de Denonvilliers est&aacute; a menudo en &iacute;ntimo contacto con el aspecto posterior de la pr&oacute;stata en la l&iacute;nea media. M&aacute;s lateralmente, la fascia de Denonvilliers contin&uacute;a su curso alrededor del recto separ&aacute;ndose del aspecto posterior de la pseudoc&aacute;psula prost&aacute;tica, formando el l&iacute;mite posterior del tri&aacute;ngulo anteriormente descrito (<a href="#f1">Figura 1</a>). Dependiendo de variaciones individuales, unas pocas fibras de la fascia Denonvilliers podr&iacute;an estar unidas en parte a la pseudoc&aacute;psula prost&aacute;tica en este &aacute;rea lateral (49). La fascia de Denonvilliers contin&uacute;a alrededor del mesorecto donde puede adelgazarse e interrumpirse (48).</font></p>     <p><a name="f2"></a></p>     <p align="center"><img src="/img/revistas/urol/v63n4/02f02.jpg"></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">El origen de la fascia de Denonvilliers es controvertido. Mientras algunos autores defienden la teor&iacute;a de la fusi&oacute;n de las vainas anterior y posterior del fondo de saco embriol&oacute;gico, otros simplemente proponen que la fascia Denonvilliers se origina de la condensaci&oacute;n de tejido areolar laxo (54).</font></p>     <p><font face="Verdana" size="2">La descripci&oacute;n del espacio triangular, orientado axialmente, que contiene el grueso de la bandeleta neurovascular parece algo simplista e intenta ser m&aacute;s did&aacute;ctico y reproducible que anat&oacute;micamente realista. La controversia en la literatura sobre la relaci&oacute;n entre la fascia del elevador del ano, la fascia Denonvilliers y los componentes de la bandeleta neurovascular pone lo anterior en evidencia.</font></p>     <p><font face="Verdana" size="2">Por ejemplo, Villers and Myers describieron que la fascia de Denonvilliers se divide en el borde posterolateral de la pr&oacute;stata en una hoja anterior y otra posterior alrededor de la bandeleta neurovascular. Mientras que la hoja anterior se convierte en la fascia prost&aacute;tica, la posterior contin&uacute;a su curso sobre el recto limitando el tri&aacute;ngulo en su porci&oacute;n posterior (47). Bas&aacute;ndose en esta representaci&oacute;n esquem&aacute;tica, se describen tres tipos de disecci&oacute;n de las bandeletas neurovasculares: (44, 45)</font></p>     <blockquote> 	    <p><font face="Verdana" size="2"><b><i>a. Plano intrafascial:</i></b> La pseudoc&aacute;psula prost&aacute;tica se deja desnuda de cualquier tejido. La anteriormente descrita hoja anterior de la fascia Denonvilliers (fascia prost&aacute;tica) se deja cubriendo el aspecto medial de la bandeleta neurovascular.</font></p> 	    <p><font face="Verdana" size="2"><b><i>b. Plano interfascial:</i></b> En este caso, la fascia prost&aacute;tica permanece cubriendo la superficie posterolateral de la pr&oacute;stata. La hoja anterior de la fascia de Denonvilliers o fascia prost&aacute;tica queda sobre la cara prost&aacute;tica y el aspecto medial de la bandeleta neurovascular queda expuesto sin ninguna fascia. As&iacute;, puede aumentar la probabilidad de lesi&oacute;n de la bandeleta neurovascular, pero ofrece al cirujano un margen oncol&oacute;gico m&aacute;s seguro, especialmente en el aspecto posterolateral de la pr&oacute;stata.</font></p> 	    <p><font face="Verdana" size="2"><b><i>c. Plano extrafascial:</i></b> es el que se lleva a cabo durante una disecci&oacute;n posterior y lateral a la bandeleta neurovascular. Se extirpa, pues, la pr&oacute;stata con todas las capas de la vaina fibroadiposoa visceral presentes en el esp&eacute;cimen (resecci&oacute;n amplia). Las bandeleta se extirpa completa o casi completamente.</font></p> </blockquote>     <p><font face="Verdana" size="2">Kourambas y colaboradores (50) difieren de esta versi&oacute;n en que la fascia de Denonvilliers se divide lateralmente en varias l&aacute;minas y que no est&aacute; claramente definida en sus bordes laterales. Demuestran cierta compartimentaci&oacute;n de las bandeletas neurovasculares por tiras de fascia en cortes axiales. Describen que la fascia de Denonvilliers representa la barra horizontal de una estructura fascial en forma de H, que deja la pr&oacute;stata anterior y el recto posterior. La extensi&oacute;n anterior de la H. est&aacute; representada por la fascia del elevador del ano izquierda y derecha y la extensi&oacute;n posterior por la fascia parietal (continuaci&oacute;n de la fascia del elevador del ano). No obstante, hay fascia prost&aacute;tica anterior a la bandeleta neurovascular y una capa de fascia de Denonvilliers posterior, lo que significa que su esquema b&aacute;sico no difiere sustancialmente del que describen Villers y Myers. Villers y Myers simplemente han tratado de simplificar, sin preocuparse por la formaci&oacute;n de hebras de fascia dentro de la bandeleta neurovascular.</font></p>     <p><font face="Verdana" size="2">Seg&uacute;n Costello y colaboradores (16), los l&iacute;mites del &aacute;rea triangular no son tan claros como se ha mencionado previamente. En la confluencia de la fascia prost&aacute;tica, la fascia de Denonvilliers y la fascia pararectal hay numerosas hojas de tejido fibroso. Los aspectos posterior y lateral de la bandeleta corren a trav&eacute;s de estas hojas (compartimentaci&oacute;n). Las fascias de Denonvilliers y pararectal est&aacute;n separadas de las superficies anterior y lateral del recto por cantidades variables de tejido adiposo perirrectal (16).</font></p>     <p><font face="Verdana" size="2">La mayor&iacute;a de los autores parecen estar de acuerdo en que hay variaciones anat&oacute;micas en el n&uacute;mero y grosor de las capas col&aacute;genas que componen la fascia prost&aacute;tica y la fascia de Denonvilliers en el aspecto posterolateral de la pr&oacute;stata. De forma similar, la localizaci&oacute;n exacta de la bandeleta puede variar, con una tendencia de las pr&oacute;statas m&aacute;s grandes a desplazar el grueso de las bandeletas m&aacute;s posteriormente (24, 25). Dem&aacute;s esta decir, que la recuperaci&oacute;n de la funci&oacute;n er&eacute;ctil en el postoperatorio no depender&aacute; solamente de la preservaci&oacute;n anat&oacute;micas de los nervios cavernosos, sino tambi&eacute;n en su estado funcional (evitar la tracci&oacute;n, etc.), as&iacute; como de otros factores anat&oacute;micos, como la preservaci&oacute;n de las arterias pudendas accesorias, (55-59) la edad, la funci&oacute;n er&eacute;ctil preoperatoria (60) y aspectos sociales.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La hoja posterior de la fascia de Denonvilliers, citada a veces en la literatura colorectal, es en realidad la fascia propia del recto (serosa) (61). El mesorecto representa la capa grasa localizada entre la fascia propia del recto y la fascia de Denonvilliers, y &eacute;ste es el plano de disecci&oacute;n que debe seguirse durante la prostatectom&iacute;a radical para minimizar el riesgo de tener un margen quir&uacute;rgico positivo en el aspecto posterior de la pr&oacute;stata (45, 62, 63). Este plano tambi&eacute;n es com&uacute;nmente seguido por los cirujanos colorectales durante la resecciones de recto (48, 61, 64).</font></p>     <p><font face="Verdana" size="2">De forma similar, la mal llamada hoja anterior de la fascia de Denonvilliers interpuesta entre el cuello vesical posterior y el aspecto anterior de la ves&iacute;cula seminal y los conductos deferentes, corresponde de hecho a las fibras longitudinales posteriores del detrusor de Gil Vernet, y que transcurren entre los orificios ureterales para insertarse distalmente en el Veru Montanum (este fasc&iacute;culo muscular fue denominado m&uacute;sculo vesicoprost&aacute;tico por Dorscher y colaboradores, m. vesicoprostaticus, TA) (65-69). Est&aacute; fascia longitudinal posterior del Detrusora est&aacute; cubierta exteriormente por la adventicia vesical (66, 69, 70). Los remanentes vesicales de estas fibras longitudinales posteriores del detrusor son lo que Rocco y colaboradores parecen usar para fijar la fascia de Denonvilliers durante la reconstrucci&oacute;n posterior del rabdoesfinter justo antes de realizar la anastomosis uretrovesical (71, 72). Existe controversia en la literatura sobre la justificaci&oacute;n y eficacia de esta t&eacute;cnica (73, 74) (ver abajo).</font></p>     <p><font face="Verdana" size="2"><b><i>Pseudoc&aacute;psula Prost&aacute;tica:</i></b></font></p>     <p><font face="Verdana" size="2">Como nos han ense&ntilde;ado los pat&oacute;logos a menudo, la pr&oacute;stata no tiene una c&aacute;psula real. La parte m&aacute;s externa de la pr&oacute;stata est&aacute; compuesta por capas variables de fasc&iacute;culos fibromusculares condensados inseparables del estroma prost&aacute;tico. Est&aacute; pseudoc&aacute;psula (47) est&aacute; casi ausente en el aspecto anterior de la pr&oacute;stata, donde se identifica el estroma fibromuscular anterior (<a href="#f1">Figura 1</a>). Adicionalmente, la pseudoc&aacute;psula est&aacute; ausente en el pico de la gl&aacute;ndula y en la base de la pr&oacute;stata, donde la misma se fusiona respectivamente con el esf&iacute;nter urinario y con el cuello vesical (49). Con respecto a la superficies laterales de la pr&oacute;stata, hay pr&oacute;statas con c&aacute;psula pero no fascia prost&aacute;tica, y pr&oacute;statas con fascia prost&aacute;tica sin c&aacute;psula, con un abanico de formas intermedias (Myers, en prensa).</font></p>     <p><font face="Verdana" size="2">Ser&iacute;a dif&iacute;cil recomendar &aacute;reas definidas en las que el cirujano deber&iacute;a enfocar predominantemente la preservaci&oacute;n nerviosa. Bas&aacute;ndose en las referencias anat&oacute;micas arriba mencionadas, algunos cirujanos han propuesto que una liberaci&oacute;n alta de la fascia en la superficie lateral de la pr&oacute;stata en pacientes seleccionados da como resultado una mejor&iacute;a de la recuperaci&oacute;n  de la funci&oacute;n er&eacute;ctil en el postoperatorio (24, 75-79). El objetivo es preservar tantas fibras nerviosas como sea posible (25, 26, 80). La potencia postoperatoria puede mejorar con el aumento del n&uacute;mero de fibras nerviosas preservadas; sin embargo, &eacute;sta es una opci&oacute;n quir&uacute;rgica que puede comprometer la operaci&oacute;n oncol&oacute;gica porque puede provocar un margen quir&uacute;rgico positivo (75).</font></p>     <p><font face="Verdana" size="2">Se debe poner especial cuidado en la regi&oacute;n apical, donde las lesiones de la bandeleta neurovascular no son raras. En este &aacute;rea, la bandeleta neurovascular se localiza s&oacute;lo a mil&iacute;metros de distancia del aspecto posterolateral de la uretra membranosa y del pico de la pr&oacute;stata bilateralmente (25) (<a href="#f3">Figura 3</a>). Est&aacute; es la raz&oacute;n por la que la liberaci&oacute;n temprana de la bandeleta neurovascular puede ayudar a minimizar el riesgo de lesi&oacute;n por tracci&oacute;n (75-77).</font></p>     <p><a name="f3"></a></p>     <p align="center"><img src="/img/revistas/urol/v63n4/02f03.jpg"></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b><i>Esf&iacute;nter urinario</i></b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">El Esf&iacute;nter urinario externo (en contraposici&oacute;n al esf&iacute;nter interno del cuello vesical) es otra estructura, que podr&iacute;a lesionarse durante la prostatectom&iacute;a radical con potenciales consecuencias delet&eacute;reas para la recuperaci&oacute;n postoperatoria de la continencia urinaria y de la calidad de vida. Por lo tanto, el conocimiento detallado de su anatom&iacute;a y funci&oacute;n se hace esencial para obtener resultados aceptables de continencia postoperatoria.</font></p>     <p><font face="Verdana" size="2">Koraitim hizo recientemente una revisi&oacute;n exhaustiva de la anatom&iacute;a y fisiolog&iacute;a del esf&iacute;nter uretral masculino (81). El esf&iacute;nter uretral tiene dos componentes relacionados morfol&oacute;gicamente pero, posiblemente, no relacionados funcionalmente, que se extienden en forma de cilindro alrededor de la uretra desde el cuello vesical hasta el extremo distal de la uretra membranosa: (1, 32, 65, 82-85) (<a target="_blank" href="/img/revistas/urol/v63n4/02t01.jpg">Tabla</a> y Figuras <a href="#f2">2</a> y <a href="#f3">3</a>)</font></p>     <p><font face="Verdana" size="2"><b>1- Esf&iacute;nter intr&iacute;nseco de m&uacute;sculo liso o esf&iacute;nter liso:</b></font></p>     <p><font face="Verdana" size="2">Se compone de una capa interna de m&uacute;sculo liso involuntario que tiene su parte principal en el cuello vesical y es m&aacute;s fino en su curso distal en la uretra. Forma un cilindro completo de fibras de m&uacute;sculo circulares alrededor de la uretra, y queda entre la mucosa uretral y el m&uacute;sculo estriado externo uretral, formando junto con el tejido conectivo y el&aacute;stico el grueso de la pared de la uretra (<a href="#f3">Figura 3</a>). Consiste en una capa diferenciada de m&uacute;sculo liso longitudinal rodeada por una capa m&aacute;s ancha de m&uacute;sculo liso circular. El esf&iacute;nter intr&iacute;nseco mantiene la continencia durante el reposo por medio de la contracci&oacute;n pasiva de sus fibras circulares, dando como resultado el cierre del orificio vesical y un estrechamiento conc&eacute;ntrico de la uretra posterior. El cierre m&aacute;ximo se asume que se da a nivel del orificio vesical, donde el esf&iacute;nter intr&iacute;nseco es m&aacute;s grueso (86) y en la uretra membranosa, donde la uretra es m&aacute;s estrecha. La contracci&oacute;n de las fibras longitudinales ensancha la uretra durante la evacuaci&oacute;n de orina. No ser&iacute;a necesaria su preservaci&oacute;n completa para asegurar la continencia pasiva posoperatoria, dado que una longitud m&iacute;nima del esf&iacute;nter de m&uacute;sculo liso ser&iacute;a suficiente para lograr tal coaptaci&oacute;n. &Eacute;sta puede ser la justificaci&oacute;n de unos mejores resultados de continencia despu&eacute;s de la prostatectom&iacute;a radical descritos en pacientes con uretras membranosas m&aacute;s largas (87).</font></p>     <p><font face="Verdana" size="2"><b>2- Esf&iacute;nter estriado uretral externo o rabdoesfinter:</b></font></p>     <p><font face="Verdana" size="2">Se compone de la capa externa de m&uacute;sculo estriado de fibras finas, predominantemente de contracci&oacute;n lenta (por contraposici&oacute;n al m&uacute;sculo esquel&eacute;tico voluntario de fibras gruesas, de contracci&oacute;n r&aacute;pida), m&aacute;s marcado y m&aacute;s grueso alrededor de la uretra membranosa que se hace gradualmente menos diferenciado hacia la vejiga (Figuras <a href="#f2">2</a> y <a href="#f3">3</a>). Desde el tend&oacute;n central del perin&eacute; hasta el pico de la pr&oacute;stata las fibras de m&uacute;sculo estriado se unen detr&aacute;s de la uretra en un rafe central fibroso (82), mientras que m&aacute;s pr&oacute;ximalmente rodean la cara anterolateral de la pr&oacute;stata (<a href="#f3">Figura 3</a>). Aunque anat&oacute;micamente es indivisible, el rabdoesfinter consiste en dos componentes distintos funcionalmente:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2"><b><i>a-</i></b> Fibras centrales que se extienden en direcci&oacute;n cef&aacute;lica sobre la uretra prost&aacute;tica.</font></p> 	    <p><font face="Verdana" size="2"><b><i>b-</i></b> Fibras caudales que se extienden sobre la uretra membranosa</font></p> </blockquote>     <p><font face="Verdana" size="2"><b><i>a-</i></b> Este m&uacute;sculo tiene que relajarse para permitir que el semen entre en la porci&oacute;n bulbar de la uretra de forma que el m&uacute;sculo bulboesponjoso (en tiempos llamado eyaculator uretrae) pueda eyacular el semen.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b><i>b-</i></b> Aunque existe controversia, las fibras m&aacute;s caudales del rabdoesf&iacute;nter compuestas por fibras estriadas mixtas de contracci&oacute;n lenta y quiz&aacute;s r&aacute;pida (88, 89), pueden ser las responsables de la continencia urinaria activa al contraerse contra el rafe medio posterior fijo, dando como resultado el colapso de la pared anterior de la uretra contra la pared posterior. Adicionalmente, se especula que tanto la fascia de Denonvilliers como el m&uacute;sculo rectouretral pueden formar una placa posterior r&iacute;gida contra la que la compresi&oacute;n de la pared uretral anterior pueda incrementar la superficie del &aacute;rea de coaptaci&oacute;n; creando as&iacute; una mayor resistencia uretral (90). Esto podr&iacute;a explicar en parte la mejor&iacute;a en acortamiento del tiempo hasta la continencia encontrado en pacientes sometidos al conocido "punto de Rocco" (71-73, 91). No obstante, otros autores no han encontrado la utilidad de esta modificaci&oacute;n t&eacute;cnica, aunque se puede argumentar que posiblemente no hayan reproducido con exactitud la reconstrucci&oacute;n de la placa uretral posterior descrita originalmente (74).</font></p>     <p><font face="Verdana" size="2">Rocco y cols. sostienen que "la fascia de Denonvilliers en su inserci&oacute;n distal act&uacute;a como un sistema de suspensi&oacute;n para la uretra prostato-membranosa y que su divisi&oacute;n durante la prostatectom&iacute;a radical da como resultado la p&eacute;rdida de la inserci&oacute;n posterior craneal del esf&iacute;nter, el desplazamiento caudal del complejo esfinteriano, y un prolapso del perin&eacute; "durante esta reconstrucci&oacute;n posterior" (72).</font></p>     <p><font face="Verdana" size="2">Desde el punto de vista embriol&oacute;gico, la fascia de Denonvilliers es una barrera entre el tracto urinario y la porci&oacute;n terminal del sistema digestivo (51, 92). El conocido como "prolapso del perin&eacute;" puede ser m&aacute;s un artefacto visual y funci&oacute;n de una presi&oacute;n intraperitoneal aumentada que realmente funci&oacute;n de la secci&oacute;n de la fascia de Denonvilliers. Traccionar de la pr&oacute;stata mientras se seccionan la uretra y las fijaciones distales de la fascia de Denonvilliers, hace creer al cirujano que la secci&oacute;n extraprost&aacute;tica de la uretra membranosa es m&aacute;s larga (o m&aacute;s intrap&eacute;lvica) de lo que realmente es (93). Adicionalmente, se puede establecer la hip&oacute;tesis de que traccionar excesivamente de la pr&oacute;stata puede rasgar algunas fibras musculares esfinterianas impactando negativamente en su adecuada funci&oacute;n postoperatoria. Se puede observar claramente durante la prostatectom&iacute;a radical laparosc&oacute;pica o rob&oacute;tica que la uretra se retrae despu&eacute;s de su secci&oacute;n a pesar de que la fijaci&oacute;n distal de la fascia de Denonvillers permanezca sin cortar. La secci&oacute;n de esta &uacute;ltima fijaci&oacute;n no tiene impacto sobre la retracci&oacute;n uretral o su longitud el&aacute;stica.</font></p>     <p><font face="Verdana" size="2">La uretra est&aacute; sujeta anterior y lateralmente, pero no existe evidencia anat&oacute;mica de que est&eacute; sujeta cranealmente por ninguna otra estructura salvo, posiblemente, la pr&oacute;stata (1). Burnett and Mostwin (82) describieron que el complejo esfinteriano uretral masculino consist&iacute;a en la uretra prostatomembranosa, la musculatura periuretral (rabdoesf&iacute;nter), la musculatura parauretral extrinseca y las estructuras de tejido conectivo de la pelvis. Existe una estructura ligamentosa que fija el rabdoesf&iacute;nter compuesta mayormente por los ligamentos pubouretrales anteriormente (porci&oacute;n m&aacute;s distal del ligamento pubovesical o delantal vesical), los ligamentos isquioprost&aacute;ticos (ligamentos de Mueller) (1) y la fascia medial del elevador del ano, lateralmente. La fijaci&oacute;n dorsal de la uretra membranosa est&aacute; sujeta a controversia. Creemos que el rafe medio se inserta en el tend&oacute;n central del perin&eacute; (82), y no en el m&uacute;sculo rectouretral como otros han descrito. Porzionato y cols (94) corroboraron las observaciones anteriores (95) de que las fibras musculares a lo largo del aspecto anterior del m&uacute;sculo rectouretral no alcanzaban la pared posterior de la uretra membranosa. La distancia media entre el m&uacute;sculo rectouretral y la uretra membranosa era de 5,3 mm en adultos y 1,0 mm en ni&ntilde;os (27, 96, 97).</font></p>     <p><font face="Verdana" size="2">Por lo tanto, no parece probable que la fascia de Denonvilliers ejerza un soporte cef&aacute;lico de la uretra. De la misma forma, Soga y cols. (27) alertan contra el riesgo de lesi&oacute;n nerviosa durante la reconstrucci&oacute;n posterior de la placa retrouretral descrita por Rocco (71, 72).</font></p>     <p><font face="Verdana" size="2">El esf&iacute;nter uretral est&aacute; inervado por ramas del nervio pudendo y por ramas auton&oacute;micas del plexo p&eacute;lvico, las cuales corren parcialmente con la bandeleta neurovascular (25, 98-101). Takenaka estimaba recientemente que la distancia entre el pico de la pr&oacute;stata y el punto donde la rama neural m&aacute;s cercana del pudendo entra en el esf&iacute;nter era de 313 mm. (17, 85). La conservaci&oacute;n de estas ramas puede mejorar la continencia urinaria postoperatoria (83), as&iacute;, parece importante limitar la disecci&oacute;n distal de la uretra membranosa. Las fibras nerviosas de la bandeleta neurovascular entran en la uretra en las posiciones 3 y 9 horarias (102). Existe controversia en la literatura sobre el papel de la preservaci&oacute;n de las bandeletas en la recuperaci&oacute;n de la continencia urinaria (36, 39, 103). Aunque no est&aacute; claro si la responsable de la mejor&iacute;a de la continencia despu&eacute;s de la cirug&iacute;a con preservaci&oacute;n de bandeletas es la preservaci&oacute;n de las bandeletas neurovasculares por s&iacute; misma o la meticulosa disecci&oacute;n requerida para separar los nervios del pico prost&aacute;tico, deben hacerse todos los esfuerzos para preservar esas fibras nerviosas siempre que la seguridad oncol&oacute;gica no se vea comprometida. Un control cuidadoso del complejo vascular dorsal es la llave para obtener un campo exang&uuml;e y conseguir una adecuada visualizaci&oacute;n de la uni&oacute;n prostatouretral y de las estructuras de la bandeleta neurovascular posterolateral. Las lesiones de la bandeleta podr&iacute;an estar causadas por traumatismo directo, por tracci&oacute;n o por inclusi&oacute;n accidental de la bandeleta en la sutura durante la ligadura del complejo de la vena dorsal o la anastomosis uretrovesical (4, 104).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Conclusi&oacute;n</b></font></p>     <p><font face="Verdana" size="2">La anatom&iacute;a de la pr&oacute;stata es compleja y puede mostrar variaciones individuales, lo cual se a&ntilde;ade a las dificultades t&eacute;cnicas de la prostatectom&iacute;a radical. Comprender la anatom&iacute;a de las fascias periprost&aacute;ticas es la llave para conseguir una resecci&oacute;n &oacute;ptima de la gl&aacute;ndula prost&aacute;tica y las ves&iacute;culas seminales con m&aacute;rgenes quir&uacute;rgicos negativos, con vistas a maximizar el control oncol&oacute;gico. Una preservaci&oacute;n precisa del esf&iacute;nter uretral y su inervaci&oacute;n auton&oacute;mica dar&aacute; lugar a unos buenos resultados de continencia urinaria en el postoperatorio. La recuperaci&oacute;n temprana de la funci&oacute;n er&eacute;ctil en el postoperatorio depender&aacute; tanto de la preservaci&oacute;n anat&oacute;mica como funcional de las estructuras neurovasculares y las arterias pudendas accesorias que rodean la pr&oacute;stata en pacientes adecuadamente seleccionados. El reconocimiento intraoperatorio de la vasculatura periprost&aacute;tica ayudar&aacute; a disminuir el sangrado y reducir las complicaciones perioperatorias.</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b>Agradecimientos</b></font></p>     <p><font face="Verdana" size="2">Los autores agradecen al Prof. Robert P. Myers no s&oacute;lo la revisi&oacute;n del manuscrito sino tambi&eacute;n su inestimable ense&ntilde;anza y tutor&iacute;a. Adicionalmente, el primer autor agradece particularmente al Dr. Luis Alberto Aponte Tinao su ayuda y apoyo. Este manuscrito ha sido parcialmente subvencionado por Coloplast de Argentina SA y Gobbi Novag SA.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Bibliograf&iacute;a y lecturas recomendadas (*lectura de inter&eacute;s y **lectura fundamental)</b></font></p>     <!-- ref --><p><font face="Verdana" size="2">**1. Myers R P. Male urethral sphincteric anatomy and radical prostatectomy. Urol Clin North Am, 1991; 18: 211.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159794&pid=S0004-0614201000040000200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**2. Bill-Axelson A, Holmberg L, Ruutu M. et al. Radical prostatectomy versus watchful waiting in early prostate cancer. N Engl J Med, 2005; 352: 1977.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159795&pid=S0004-0614201000040000200002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**3. Ohori M, Scardino P T. Localized prostate cancer. Curr Probl Surg, 2002; 39: 833.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159796&pid=S0004-0614201000040000200003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**4. Catalona W J, Carvalhal G F, Mager D E, et al. Potency, continence and complication rates in 1,870 consecutive radical retropubic prostatectomies. J Urol, 1999; 162: 433.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159797&pid=S0004-0614201000040000200004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**5. Hull G W, Rabbani F, Abbas F. et al. Cancer control with radical prostatectomy alone in 1,000 consecutive patients. J Urol, 2002; 167: 528.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159798&pid=S0004-0614201000040000200005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**6. Michl U H, Friedrich M G, Graefen M, et al. Prediction of postoperative sexual function after nerve sparing radical retropubic prostatectomy. J Urol, 2006; 176: 227.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159799&pid=S0004-0614201000040000200006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**7. Roehl K A, Han M, Ramos C G, et al. Cancer progression and survival rates following anatomical radical retropubic prostatectomy in 3,478 consecutive patients: long-term results. J Urol, 2004; 172: 910.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159800&pid=S0004-0614201000040000200007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">8. Touijer K, Romero Otero J, Secin F P et al. 750 Radical prostatectomy: a non-randomized comparative analysis of outcomes between the open and laparoscopic approach. European Urology Supplements, 2007; 6: 210.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159801&pid=S0004-0614201000040000200008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">9. Rassweiler J, Seemann O, Schulze M, et al. Laparoscopic Versus Open Radical Prostatectomy: A Comparative Study at a Single Institution. The Journal of Urology, 2003; 169: 1689.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159802&pid=S0004-0614201000040000200009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">10. Rassweiler J, Stolzenburg J, Sulser T, et al. 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Urologic Clinics of North America, 200431: 701.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159804&pid=S0004-0614201000040000200011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">12. Palmer K J, Shah K, Thaly R. et al. MP-18.04: Robotic-assisted laparoscopic radical prostatectomy: perioperative outcomes of 1500 consecutive cases. Urology, 2007; 70: 136.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159805&pid=S0004-0614201000040000200012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">13. Smith J J A. Robotically assisted laparoscopic prostatectomy: An assessment of its contemporary role in the surgical management of localized prostate cancer. The American Journal of Surgery, 2004; 188: 63.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159806&pid=S0004-0614201000040000200013&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">14. Ficarra V, Novara G, Artibani W, et al. Retropubic, Laparoscopic, and Robot-Assisted Radical Prostatectomy: A Systematic Review and Cumulative Analysis of Comparative Studies. Eur Urol, 2009.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159807&pid=S0004-0614201000040000200014&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**15. Myers R P. Practical surgical anatomy for radical prostatectomy. Urol Clin North Am, 2001; 28: 473.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159808&pid=S0004-0614201000040000200015&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**16. Costello A J, Brooks M, Cole O J. Anatomical studies of the neurovascular bundle and cavernosal nerves. BJU Int, 2004; 94: 1071,</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159809&pid=S0004-0614201000040000200016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**17. Takenaka A, Hara R, Soga H, et al. A novel technique for approaching the endopelvic fascia in retropubic radical prostatectomy, based on an anatomical study of fixed and fresh cadavers. BJU Int, 2005; 95: 766.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159810&pid=S0004-0614201000040000200017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">**18. Walz J, Graefen M, Huland H. 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EAU Update Series, 2005; 3: 77.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1159897&pid=S0004-0614201000040000200104&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>&nbsp;</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b><a name="back"></a><a href="#top"><img src="/img/revistas/urol/v63n4/seta.jpg" border="0"></a>Dirección para correspondencia:</b>    <br>Fernando P. Secin    <br>Hospital Universitario CEMIC    <br>Av. Galvan 4120 C1431 FWO    <br>Ciudad Aut&oacute;noma de Buenos Aires (Argentina)    <br><a href="mailto:fsecin@yahoo.com">fsecin@yahoo.com</a></font></p>     <p><font face="Verdana" size="2">Aceptado para publicar: 30 de mayo 2009.</font></p>      ]]></body><back>
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<article-title xml:lang="en"><![CDATA[Indication, Technique and Outcome of Retropubic Nerve-Sparing Radical Prostatectomy]]></article-title>
<source><![CDATA[EAU Update Series,]]></source>
<year>2005</year>
<volume>3</volume>
<page-range>77</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
