<?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>2524-177X</journal-id>
<journal-title><![CDATA[Revista médica del Hospital General de México]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. med. Hosp. Gen. Méx.]]></abbrev-journal-title>
<issn>2524-177X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Médica del Hospital General de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2524-177X2019000300147</article-id>
<article-id pub-id-type="doi">10.24875/hgmx.m19000014</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Anal tumors with infrequent histology: Analysis of a series of cases and literature review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sordo-Mejía]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villanueva-Herrero]]></surname>
<given-names><![CDATA[Juan A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Macedo]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval-Martínez]]></surname>
<given-names><![CDATA[Marco D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nuñez-García]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Bobadilla]]></surname>
<given-names><![CDATA[Billy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital General de México "Dr. Eduardo Liceaga" Servicio de Coloproctología ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,American British Cowdray Medical Center  ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>82</volume>
<numero>3</numero>
<fpage>147</fpage>
<lpage>150</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2524-177X2019000300147&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2524-177X2019000300147&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2524-177X2019000300147&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ Background: The most frequent tumor of the anal region is epidermoid carcinoma; however, other types of tumors such as melanomas, sarcomas, and lymphomas can also develop. Most of them present similar symptoms although diagnosis and prognosis might be radically different.  Objective: The objective of this study was to report the clinical and histopathological characteristics of a group of patients diagnosed with non-epidermoid anal neoplasm in a third-level hospital.  Materials and Methods: Eight patients with non-epidermoid anal neoplastic biopsy samples were evaluated from March 2013 to January 2017. Demographic data and histopathological results were obtained from the clinical records.  Results: Mean age of the patients was 48.9 years (23-84); 37.5% of women and 62.5% of men. Patients presented with rectal bleeding in 25%, anal pain 87.5%, anal tumor 75%, and fever 25%. Among the patients, 37.5% presented with melanoma and 62.5% lymphoma. Regarding patients with lymphoma, 60% had plasmablastic lymphoma and 40% non-Hodgkin's lymphoma. The diagnostic time was 4 months on average (1-8 months) and 25% of the patients had been previously misdiagnosed with hemorrhoidal disease.  Conclusion: Non-epidermoid anal neoplasm cases are infrequent and its accurate diagnosis can take months, therefore, changing prognosis.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Melanoma]]></kwd>
<kwd lng="en"><![CDATA[Plasmablastic lymphoma]]></kwd>
<kwd lng="en"><![CDATA[Anal neoplasm abdominoperineal resection]]></kwd>
<kwd lng="en"><![CDATA[Anal pain]]></kwd>
<kwd lng="en"><![CDATA[Colonoscopy]]></kwd>
<kwd lng="en"><![CDATA[Endoanal ultrasound]]></kwd>
</kwd-group>
</article-meta>
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