<?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>2444-7986</journal-id>
<journal-title><![CDATA[Revista ORL]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. ORL]]></abbrev-journal-title>
<issn>2444-7986</issn>
<publisher>
<publisher-name><![CDATA[Ediciones Universidad de Salamanca]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2444-79862021000100007</article-id>
<article-id pub-id-type="doi">10.14201/orl.23207</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Prevalencia de tumores metastásicos en la glándula tiroides. Revisión sistemática y metanálisis]]></article-title>
<article-title xml:lang="en"><![CDATA[Prevalence of metastatic tumors in the thyroid gland. Systematic review and meta-analysis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodrigo-Gómez]]></surname>
<given-names><![CDATA[Lucía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pardal-Refoyo]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Batuecas-Caletrío]]></surname>
<given-names><![CDATA[Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Salamanca Facultad de Medicina Departamento de Cirugía]]></institution>
<addr-line><![CDATA[Salamanca ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Universitario de Salamanca Servicio de Otorrinolaringología y Cirugía de Cabeza y Cuello Instituto de Investigación Biomédica de Salamanca (IBSAL)]]></institution>
<addr-line><![CDATA[Salamanca ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>12</volume>
<numero>1</numero>
<fpage>67</fpage>
<lpage>83</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S2444-79862021000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S2444-79862021000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S2444-79862021000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción y objetivo: Los tumores metastásicos en la glándula tiroides complican el diagnóstico, el tratamiento y el pronóstico del paciente. El objetivo es conocer la prevalencia de las metástasis en la glándula tiroides referida en la literatura médica y los tumores primarios que con más frecuencia metastatizan en la glándula tiroides.  Método: Se realizó una revisión bibliográfica sistemática en las bases de datos de PubMed, La Biblioteca Cochrane y Scopus. Los artículos seleccionados se dividieron en dos grupos, series clínicas de pacientes en los que se hallaron metástasis en tiroides (grupo A) y series de hallazgos de metástasis en tiroides en autopsias (grupo B). Se realizó metanálisis de prevalencia para cada grupo de artículos siguiendo el modelo de efectos aleatorios.  Resultados: La prevalencia en cada grupo con su índice de confianza al 95 % fue 0.00479 (0.002-0.007) para el grupo A y 0.0362 (0.014-0.059) para el grupo B. La prevalencia de metástasis halladas en autopsias fue 7,58 veces mayor que en los estudios clínicos. En el grupo A la edad media fue 60.82 y en el grupo B 57.20. En ambos grupos las metástasis halladas en tiroides fueron más frecuentes en el sexo femenino. La localización del tumor primario fue diferente en ambos grupos, en el grupo A fue el cáncer de riñón y en el grupo B el cáncer de mama. La variabilidad de la prevalencia de metástasis en tiroides en los diferentes artículos de ambos grupos hace que este estudio tuviese una alta heterogeneidad (índice I2 y Q). Los funnel plot de ambos grupos indicaron alto sesgo de publicación.  Discusión: La diferente prevalencia entre series clínicas y autopsias puede implicar que la detección de metástasis en tiroides en la clínica está infradiagnosticada. La razón de esto podría ser que las metástasis intratiroideas se presentan de forma asintomática siendo diagnosticadas como hallazgo casual en autopsias. En otras ocasiones se presentan como un nódulo tiroideo años después del tumor primario, lo que condiciona el diagnóstico.  Conclusiones: La prevalencia de metástasis en tiroides es superior en las series de autopsias que en series clínicas (hasta 6.67 veces más frecuente en nuestro estudio). Las metástasis intratiroideas probablemente están infradiagnosticadas por cursar sin clínica siendo diagnosticadas como hallazgo casual en autopsias. Los tumores primarios más frecuentes fueron el riñón (series clínicas) y la mama (series de autopsias).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction and objective: Metastatic tumors in thyroid complicate the diagnosis, treatment, and prognosis of the patient. The objective is to determine the prevalence of metastasis in the thyroid gland reported in the medical literature and to examine the primary tumors that most frequently metastasize to the thyroid gland.  Method: A systematic bibliographic review was undertaken in the PubMed, The Cochrane Library and Scopus databases. The selected articles were divided into two groups, clinical series of patients in whom thyroid metastasis were found (group A) and series of findings of metastasis in thyroid at autopsy (group B). Prevalence meta- analysis were performed for each group of articles following the random effects model.  Results: The prevalence in each group with its 95 % confidence index was 0.00479 (0.002-0.007) for group A and 0.0362 (0.014-0.059) for group B. The prevalence of metastasis found at autopsies was 6.67 times higher than in clinical studies. In group A the mean age was 60.82 and in group B it was 57.20. In both groups, metastases found in the thyroid were more frequent in the female sex. The location of the primary tumor was different in both groups, in group A it was kidney cancer and in group B it was breast cancer. The variability of the prevalence of thyroid metastasis in the different articles of both groups makes this study highly heterogeneous (index I2 and Q). The funnel plots of both groups indicated high publication bias.  Discussion: The different prevalence between clinical series and autopsies may imply that the detection of thy- roid metastases in the clinic is underdiagnosed. The reason for this could be that intrathyroid metastases appear asymptomatically, being diagnosed as an incidental finding at autopsy. On other occasions they present as a thyroid nodule years after the primary tumor, which determines the diagnosis.  Conclusions: The prevalence of thyroid metastases is higher in autopsy series than in clinical series (up to 7.58 times more frequent in our study). Intrathyroid metastasis are probably underdiagnosed because they are not clinical, and they are diagnosed as a casual finding at autopsy. The most frequent primary tumors were the kidney (clinical series) and the breast (autopsy series).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[metástasis en tiroides]]></kwd>
<kwd lng="es"><![CDATA[metástasis intratiroideas]]></kwd>
<kwd lng="es"><![CDATA[prevalencia]]></kwd>
<kwd lng="es"><![CDATA[neoplasia secundaria de tiroides]]></kwd>
<kwd lng="es"><![CDATA[revisión]]></kwd>
<kwd lng="es"><![CDATA[metanálisis]]></kwd>
<kwd lng="en"><![CDATA[metastasis in thyroid]]></kwd>
<kwd lng="en"><![CDATA[intrathyroid metastasis]]></kwd>
<kwd lng="en"><![CDATA[prevalence]]></kwd>
<kwd lng="en"><![CDATA[secondary thyroid neoplasm]]></kwd>
<kwd lng="en"><![CDATA[review]]></kwd>
<kwd lng="en"><![CDATA[meta-analysis]]></kwd>
</kwd-group>
</article-meta>
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