<?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>0212-7199</journal-id>
<journal-title><![CDATA[Anales de Medicina Interna]]></journal-title>
<abbrev-journal-title><![CDATA[An. Med. Interna (Madrid)]]></abbrev-journal-title>
<issn>0212-7199</issn>
<publisher>
<publisher-name><![CDATA[Arán Ediciones, S. L.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0212-71992007000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Hematopoyesis extramedular: ¿mecanismo compensador o síndrome clínico? Descripción de un caso y revisión bibliográfica]]></article-title>
<article-title xml:lang="en"><![CDATA[Extramedullary hematopoiesis: compensatory mechanism or clinic syndrome? Case report and review of literature]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosada]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bindi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinelli]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pandolfo]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cassetti]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castiglioni]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universitaria Pisana Ospedale Cisanello Azienda Ospedaliera]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Italia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<volume>24</volume>
<numero>2</numero>
<fpage>77</fpage>
<lpage>80</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-71992007000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-71992007000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-71992007000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La hematopoyesis extramedular (HEM) es clásicamente considerada un mecanismo compensador en pacientes con anemia crónica. Hígado, bazo y ganglios linfáticos son frecuentemente implicados. Sin embargo la HEM puede también desarrollarse, de manera generalmente asintomática, en otras localizaciones como timo, riñón, retroperitoneo, área paravertebral del tórax, pulmón, intestino y otras. Raramente es sintomática (HEMS), presentándose con una gran variedad de cuadros clínicos con evolución a veces fatal. Esta forma es subvalorada y poco conocida. Su reconocimiento como entidad clínica permite un diagnóstico precoz evitando, cuando es posible, una evolución letal. Los autores describen un caso donde fueron encontradas células de la médula ósea en el análisis del líquido cefaloraquídeo (LCR) de un paciente con linfoma no Hodgkin (LNH).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Extramedullary hematopoiesis (EMH) is a compensatory mechanism occurring in patients with chronic anemia. Liver, spleen, and lymph nodes are frequently involved. However, EMH may also develop in several sites such as thymus, kidneys, retroperitoneum, paravertebral areas of the thorax, lungs, bowel and others. Rarely symptomatic, it often shows a variety of clinical features. This condition, frequently, may be fatal. A correct early diagnosis of EHM might avoid, if possible, a bad prognosis. The Authors report a case where bone marrow cells were identified in centrifuge cerebrospinal fluid of a patient suffering from non-Hodgkin lymphoma.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hematopoyesis extramedular]]></kwd>
<kwd lng="es"><![CDATA[Líquido cefaloraquídeo]]></kwd>
<kwd lng="es"><![CDATA[Linfoma no Hodgkin]]></kwd>
<kwd lng="en"><![CDATA[Extramedullary hematopoiesis]]></kwd>
<kwd lng="en"><![CDATA[Cerebrospinal fluid]]></kwd>
<kwd lng="en"><![CDATA[Non-Hodgkin lymphoma]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p>&nbsp;</p>     <p>&nbsp;</p>     <p><b><font size="2" face="Verdana"><a name="top"></a></font> <font size="4" face="Verdana">Hematopoyesis extramedular: ¿mecanismo compensador o s&iacute;ndrome cl&iacute;nico? Descripci&oacute;n de un caso y revisi&oacute;n bibliogr&aacute;fica</font></b></p>     <p><b><font size="4" face="Verdana">Extramedullary hematopoiesis: compensatory mechanism or clinic syndrome? Case report and review of literature</font></b></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><b><font size="2" face="Verdana">J. Rosada, M. Bindi, M. Pinelli, C. Pandolfo, G. Cassetti,  M. Castiglioni</font></b></p>     <p><font size="2" face="Verdana">Unit&aacute; Operativa Medicina Interna IVº - Ospedale Cisanello, Azienda Ospedaliera. Universitaria Pisana, Italia</font></p>     <p><font face="Verdana" size="2"><a href="#back">Dirección para correspondencia</a></font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p><hr size="1">      <p><B><font size="2" face="Verdana">RESUMEN</font></B></p>    <p> <font size="2" face="Verdana">La hematopoyesis extramedular (HEM) es cl&aacute;sicamente considerada un mecanismo compensador en pacientes con anemia cr&oacute;nica. H&iacute;gado, bazo y ganglios linf&aacute;ticos son frecuentemente implicados. Sin embargo la HEM puede tambi&eacute;n desarrollarse, de manera generalmente asintom&aacute;tica, en otras localizaciones como timo, ri&ntilde;&oacute;n, retroperitoneo, &aacute;rea paravertebral del t&oacute;rax, pulm&oacute;n, intestino y otras. Raramente es sintom&aacute;tica (HEMS), present&aacute;ndose con una gran variedad de cuadros cl&iacute;nicos con evoluci&oacute;n a veces fatal. Esta forma es subvalorada y poco conocida. Su reconocimiento como entidad cl&iacute;nica permite un diagn&oacute;stico precoz evitando, cuando es posible, una evoluci&oacute;n letal. Los autores describen un caso donde fueron encontradas c&eacute;lulas de la m&eacute;dula &oacute;sea en el an&aacute;lisis del l&iacute;quido cefaloraqu&iacute;deo (LCR) de un paciente con linfoma no Hodgkin (LNH).</font></p>     <p><font face="Verdana"><B><font size="2">Palabras clave:</font></B><font size="2"> Hematopoyesis extramedular. L&iacute;quido cefaloraqu&iacute;deo. Linfoma no Hodgkin.</font></font></p>  <hr size="1">      <p><B><font size="2" face="Verdana">ABSTRACT</font></B></p>     <p><font size="2" face="Verdana">Extramedullary hematopoiesis (EMH) is a compensatory mechanism occurring in patients with chronic anemia. Liver, spleen, and lymph nodes are frequently involved. However, EMH may also develop in several sites such as thymus, kidneys, retroperitoneum, paravertebral areas of the thorax, lungs, bowel and others. Rarely symptomatic, it often shows a variety of clinical features. This condition, frequently, may be fatal. A correct early diagnosis of EHM might avoid, if possible, a bad prognosis. The Authors report a case where bone marrow cells were identified in centrifuge cerebrospinal fluid of a patient suffering from non-Hodgkin lymphoma.</font></p>     <p><font face="Verdana"><B><font size="2">Key words:</font></B><font size="2"> Extramedullary hematopoiesis. Cerebrospinal fluid. Non-Hodgkin lymphoma.</font></font></p>  <hr size="1">      <p>&nbsp;</p>     <p><B><font face="Verdana">Introducción</font></B></p>     <p><font size="2" face="Verdana">La presencia de c&eacute;lulas hematopoy&eacute;ticas progenitoras con localizaci&oacute;n extramedular es caracter&iacute;stica de la etapa de vida intra-uterina. Durante el segundo trimestre de gestaci&oacute;n el h&iacute;gado se convierte en la principal fuente productora de gl&oacute;bulos rojos, aunque si una cierta cantidad de hemat&iacute;es se produce a&uacute;n en el bazo y en los ganglios linf&aacute;ticos. A partir de los &ugrave;ltimos meses de gestaci&oacute;n y hasta los 5 a&ntilde;os de edad, los eritrocitos, granulocitos y monocitos se producen exclusivamente en la m&eacute;dula &oacute;sea de casi todos los huesos. Despu&eacute;s de los 20 a&ntilde;os los componentes de las tres principales l&iacute;neas hematopoy&eacute;ticas se forman en el tejido medular de los huesos planos. Tambi&eacute;n en estos huesos la hematopoyesis disminuye con el avanzar de la edad (1). Se describe un caso de HEM con localizaci&oacute;n men&iacute;ngea y se revisa la literatura a prop&oacute;sito.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><B><font face="Verdana">Caso aportado</font></B></p>     <p><font size="2" face="Verdana">Var&oacute;n italiano de 64 a&ntilde;os ingresa en marzo del 2005 por intensa cefalea, fiebre continua y pancitopenia. En la historia resulta padecer de LNH di tipo B grado II (Real) ya tratado con quemioterapia seg&uacute;n el esquema CHOP-R y sucesivamente con altas dosis de ciclofosfamida con el objetivo de movilizar las c&eacute;lulas estaminales en previsi&oacute;n de autotrasplante, por otra parte, nunca efectuado. Una reciente TAC total body describ&iacute;a una remisi&oacute;n de la enfermedad linfomatosa mientras la biopsia osteomedular evidencia una mielodisplasia secundaria en ausencia de infiltraci&oacute;n neopl&aacute;sica.</font></p>     <p><font size="2" face="Verdana">A su ingreso en el hospital en la exploraci&oacute;n f&iacute;sica se aprecia fiebre de 39 &deg;C, palidez cutaneomucosa y esplenomegalia, PA 110/70 mmHg, frecuencia cardiaca 128 latidos por minuto. El resto de la exploraci&oacute;n f&iacute;sica inicial es compatible con la normalidad.</font></p>     <p><font face="Verdana"><i><font size="2">Exploraciones complementarias</font></i><font size="2">. Los primeros an&aacute;lisis (<a href="#t1">Tabla I</a>) muestran, entre otras cosas, pancitopenia con neutropenia de 830/ul. Se efectuaban ex&aacute;menes virol&oacute;gicos (negativos) y hemocultivos seriados. Una TAC de cr&aacute;neo no mostraba lesiones focales agudas ni signos de ipertensi&oacute;n cerebral. El paciente se trata con terapia de sost&eacute;n, factores de crecimiento granulocitario, antimic&oacute;ticos y antibi&oacute;ticos de amplio espectro de acci&oacute;n, con remisi&oacute;n del cuadro hematol&oacute;gico (<a href="#t1">Tabla I</a>) y resoluci&oacute;n de la fiebre. Por el persistir de la cefalea y la aparici&oacute;n sucesiva de signos men&iacute;ngeos se efectuaba una punci&oacute;n lumbar diagn&oacute;stica. El an&aacute;lisis microsc&oacute;pico del LCR muestra un incremento del n&uacute;mero total de c&eacute;lulas, constituidas por un gran n&uacute;mero de neutr&oacute;filos, megacariocitos y c&eacute;lulas mieloides con maduraci&oacute;n intermedia; cuadro representativo de una poblaci&oacute;n medular. El an&aacute;lisis citol&oacute;gico inmunohistoqu&iacute;mico se presentaba compatible con metaplasia mieloide: factor VIII y mieloperoxidasa positivos en los elementos morfol&oacute;gicamente compatibles. El an&aacute;lisis repetido del LCR en comparaci&oacute;n con la sangre perif&eacute;rica y el hecho que ninguna raquic&eacute;ntesis fuera traum&aacute;tica o de dif&iacute;cil ejecuci&oacute;n excluye la contaminaci&oacute;n. Mientras tanto resulta positivo el hemocultivo a <i>Sterotrophomonas maltophilia</i> sensible al tratamiento antibi&oacute;tico en acto. Dos semanas despu&eacute;s del ingreso las condiciones neurol&oacute;gicas del paciente empeoran, entra en coma cerebral y fallece.</font></font></p>     <p align="center"><font size="2" face="Verdana"><a name="t1"><img src="/img/revistas/ami/v24n2/nota3_t1.jpg" width="350" height="732"></a></font></p>      <p>&nbsp;</p>     <p><B><font face="Verdana">Discusión</font></B></p>     <p><font size="2" face="Verdana">La HEM en el adulto es infrecuente y en general considerada un mecanismo compensador en pacientes con anemia cr&oacute;nica. Esta condici&oacute;n puede presentarse en curso de hemoglobinopat&iacute;as, anemias hemol&iacute;ticas, leucemias, enfermedades mieloproliferativas, linfomas o asociada a una pancitopenia yatrog&eacute;nica. Raramente acompa&ntilde;ando anemias carenciales (2), precedendo la manifestaci&oacute;n clinica de la enfermedad hematol&oacute;gica a la base (3) o en ausencia de alteraci&oacute;n hematol&oacute;gica asociada (4). Bazo, h&iacute;gado y ganglios linf&aacute;ticos son frecuentemente implicados, m&aacute;s raramente pulm&oacute;n, timo, ri&ntilde;&oacute;n, aparato gastrointestinal y urinario, retroperitoneo, &aacute;rea paravertebral del t&oacute;rax, SNC y otros. Como suele ser asintom&aacute;tica la mayor parte de las veces es un hallazgo post-mortem.</font></p>     <p><font size="2" face="Verdana">Cuando la HEM es sintom&aacute;tica (HEMS) no deber&iacute;a ser considerada un mecanismo compensador sino una verdadera entidad cl&iacute;nica que se presenta, seg&uacute;n el &oacute;rgano o aparato interesado, con una gran variedad de cuadros cl&iacute;nicos. Para facilitar la descripci&oacute;n de algunos de estos nosotros preferimos agruparlos en 6 tipos: a) la HEMS que complica el SNC y perif&eacute;rico, uno de los m&aacute;s frecuentes en esta rara patolog&iacute;a, que puede presentarse como cefalea intratable (5-7), afectactaci&oacute;n cerebelar (8), afasia (7), hemiparesis (7), p&eacute;rdida del control esfint&eacute;rico (6,7), otros signos de compresi&oacute;n medular (9-12), una banal ciatalgia (13), un exoftalmo monolateral(7), una hemorragia subdural (14) o paraparesis-paraplej&iacute;a (6,15); b) la HEMS tor&aacute;cica puede agredir los pulmones y la pleura dando lugar a fibrosis pulmonar (16), derrame pleuritico mono o bilateral (17-19), hemot&oacute;rax (20,21) a veces fatales (22), se puede presentar como una masa mediastinal o intrator&aacute;cica de dif&iacute;cil interpretaci&oacute;n (23) o infiltrar el coraz&oacute;n present&aacute;ndose como precordialgia, disnea cardiaca (24), tamponamiento (24-26) o masa intraatrial (27,28) (la afectaci&oacute;n mioc&aacute;rdica en particular la asociaci&oacute;n con IMA es al contrario discutible); c) en la HEMS abdominal es frecuente la infiltraci&oacute;n peritoneal como ascitis severa (19), incluso refractaria (29) o como un tejido proliferante que determina, en esta &uacute;ltima forma, problemas en el diagn&oacute;stico diferencial de la carcinomatosis o del mesotelioma peritoneal (30), cuando su localizaci&oacute;n es perirenal o retroperitoneal se asocia a cuadros de uropat&iacute;a obstructiva, infiltraci&oacute;n tubulointersticial y urolitiasis, s&iacute;ndrome nefr&oacute;tico y glomerulonefritis (31,32), insuficiencia renal aguda (33) o puede manifestarse, tambi&eacute;n aqu&iacute;, como una masa de dudoso significado (34); d) en la presentaci&oacute;n intestinal, adem&aacute;s de las hemorragias (35), se reportan casos de estre&ntilde;imiento importante (36), de oclusi&oacute;n o abdomen agudo quir&uacute;rgico (37); e) la HEMS cut&aacute;nea, de peor pron&oacute;stico, puede presentarse sola o acompa&ntilde;ando las otras formas (26,38) y es caracterizada por un cuadro heterog&eacute;neo: n&oacute;dulos, lesiones papulares rojo-violetas (38), eritema papular o difuso, lesiones ulceradas, placas eritematosas, ampollas (39,40); y f) otras localizaciones menos reportadas son tiroides (3,41) como un n&oacute;dulo &uacute;nico o como bocio multinodular, suprarrenal (42), test&iacute;culo (38), pr&oacute;stata (43), ovario (44), endometrio (45) y o&iacute;do medio (46) (todos los tejidos, &oacute;rganos o sistemas pueden ser interesados).</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">El tratamiento de la HEMS es muy discutido y no existe un acuerdo entre los diferentes autores. En los casos no fatales registrados algunos se resuelven espontaneamente (21), otros con un intenso r&eacute;gimen de trasfusiones (11,12,15), con radioterapia (7,31), cirug&iacute;a o con combinaciones (47,48) de estos tratamientos seg&uacute;n la localizaci&oacute;n y la modalidad de presentaci&oacute;n. La HEM es una patolog&iacute;a infrecuente, poco conocida, con frecuencia de tipo compensador a una hemopoyesis medular alterada. En nuestro caso la infiltraci&oacute;n meningoencef&aacute;lico de la HEM en vez de comportarse como un mecanismo compensador de la hematopoyesis por el da&ntilde;o medular postquemioter&aacute;pico, desarroll&oacute; un cuadro sindr&oacute;mico neurol&oacute;gico con evoluci&oacute;n letal. Los cuadros clinicos de presentaci&oacute;n son numerosos y con evoluciones diversas. El conocimiento de esta patolog&iacute;a nos ayuda por un lado, a no disminuir la importancia de una sintomatolog&iacute;a no precisa que si se diagnostica precozmente, puede ser tratada y por otro lado a evitar, cuando es posible, una evoluci&oacute;n desfavorable.</font></p>     <p>&nbsp;</p>     <p><B><font face="Verdana">Bibliografía</font></B></p>     <!-- ref --><p><font size="2" face="Verdana">1. Guyton AC, Hall JE. Globuli rossi, anemia e policitemia. In: EdiSES s.r.l., editors. Fisiologia Medica. 9th ed. Cit&agrave; di Castello (PG): Sograte s.r.l.; 1999, p. 431-43.</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=602905&pid=S0212-7199200700020000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>   <font size="2" face="Verdana">2. Fielding JR, Owens M, Naimark A. Intrathoracic extramedullary hematopoiesis secondary to B12 and folate deficiency: CT appearance. J Comput Assist Tomogr. 1991; 15: 308-10.</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=602906&pid=S0212-7199200700020000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>   <font size="2" face="Verdana">3. Leoni F, Fabbri R, et al. Extramedullary haematopoiesis in the thyroid multinodular goitre preceding clinical evidence of agnogenic myeloid metaplasia. 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