<?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>1870-7203</journal-id>
<journal-title><![CDATA[Acta médica Grupo Ángeles]]></journal-title>
<abbrev-journal-title><![CDATA[Acta méd. Grupo Ángeles]]></abbrev-journal-title>
<issn>1870-7203</issn>
<publisher>
<publisher-name><![CDATA[Grupo Ángeles, Servicios de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-72032025000400381</article-id>
<article-id pub-id-type="doi">10.35366/120533</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Carcinoma de células de Merkel perianal]]></article-title>
<article-title xml:lang="en"><![CDATA[Perianal Merkel cell carcinoma]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gallo Arriaga]]></surname>
<given-names><![CDATA[Benjamín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3 "/>
<xref ref-type="aff" rid="Af1"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gallo Chico]]></surname>
<given-names><![CDATA[Benjamín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo Valadez]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ibarra Rodríguez]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre Trigueros]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santiago Pascual]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Rodríguez]]></surname>
<given-names><![CDATA[Erika]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vilches Bautista]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Angeles León Servicio de Cirugía Gastrointestinal ]]></institution>
<addr-line><![CDATA[León Guanajuato]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guanajuato División de Ciencias de la Salud Departamento de Medicina y Nutrición]]></institution>
<addr-line><![CDATA[León Guanajuato]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Hospital Angeles León Servicio de Gastroenterología ]]></institution>
<addr-line><![CDATA[León Guanajuato]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Hospital Angeles León Servicio de Anatomía Patológica ]]></institution>
<addr-line><![CDATA[León Guanajuato]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<volume>23</volume>
<numero>4</numero>
<fpage>381</fpage>
<lpage>383</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-72032025000400381&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-72032025000400381&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-72032025000400381&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  El carcinoma de células de Merkel (CCM) es raro, se desarrolla en áreas de la piel expuestas al sol en individuos mayores de 50 años; tiende a crecer rápidamente y dar metástasis a distancia.  Caso clínico:  Masculino de 77 años, con tumoración no dolorosa en la fosa isquiorrectal izquierda. El ultrasonido reportó un nódulo de 52.6 × 35.8 × 24.6 mm, que fue resecado; histopatología reportó carcinoma neuroendocrino, poco diferenciado. Inmunohistoquímica: compatible con CCM.  Conclusión:  El CCM es un cáncer de piel de origen neuroendocrino. El tratamiento incluye cirugía, radioterapia y quimioterapia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  Merkel cell carcinoma (MCC) is rare; it develops in areas of the skin exposed to the sun in individuals over 50 years of age. It tends to grow rapidly and metastasize at a distance.  Case report:  A 77-year-old male with a painless tumor in the left ischiorectal fossa. The ultrasound reported a nodule, which was resected, measuring 52.6 × 35.8 × 24.6 mm. Histopathology reported neuroendocrine carcinoma, poorly differentiated. Immunohistochemistry: compatible with CCM.  Conclusion:  MCC is a skin cancer of neuroendocrine origin. The treatment includes surgery, radiotherapy, and chemotherapy.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[carcinoma de células de Merkel]]></kwd>
<kwd lng="es"><![CDATA[cáncer de piel]]></kwd>
<kwd lng="es"><![CDATA[metástasis]]></kwd>
<kwd lng="es"><![CDATA[carcinoma neuroendocrino]]></kwd>
<kwd lng="en"><![CDATA[Merkel cell carcinoma]]></kwd>
<kwd lng="en"><![CDATA[skin cancer]]></kwd>
<kwd lng="en"><![CDATA[metastasis]]></kwd>
<kwd lng="en"><![CDATA[neuroendocrine carcinoma]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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