<?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>2565-005X</journal-id>
<journal-title><![CDATA[Gaceta mexicana de oncología]]></journal-title>
<abbrev-journal-title><![CDATA[Gac. mex. oncol.]]></abbrev-journal-title>
<issn>2565-005X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Oncología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2565-005X2022000500064</article-id>
<article-id pub-id-type="doi">10.24875/j.gamo.22000087</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Metastatic jejunal neuroendocrine tumor to the breast: Case report and literature review]]></article-title>
<article-title xml:lang="es"><![CDATA[Tumor metastásico neuroendocrino de yeyuno a mama: reporte de caso y revisión de la literatura]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Christlien]]></surname>
<given-names><![CDATA[Gonzalo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-García-Granados]]></surname>
<given-names><![CDATA[Ana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kajomovitz-Bialostozky]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro Médico ABC General Surgery Service ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro Médico ABC Oncologic Surgery Service ]]></institution>
<addr-line><![CDATA[ Mexico City]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>21</volume>
<fpage>64</fpage>
<lpage>66</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2565-005X2022000500064&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2565-005X2022000500064&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2565-005X2022000500064&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Neuroendocrine tumors (NETs) are the most prevalent neoplasm of the small bowel; these present a diagnostic challenge because of their low prevalence and non-specific clinical manifestations. Breast metastasis is rare. We present the case of a 55-year-old female with a painful nodule in the right breast. Mammography reported a solid mass, BBIRADS 4C, with no axillary lymph nodes. Biopsy reported infiltrating ductal carcinoma. Conservative surgery was performed. Histopathology findings are compatible with a well-differentiated (G2) metastatic NET with a gastrointestinal primary. Ga. DOTANOC positron emission tomography/computed tomography scan showed proximal jejunum diffuse mucosal thickening with two foci of increased radiotracer uptake with adjacent adenopathies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los tumores neuroendocrinos son la neoplasia de intestino delgado más frecuente. Presentan un difícil diagnóstico debido a su baja prevalencia y manifestaciones clínicas no específicas. Las metástasis a mama son raras. Presentamos el caso de una paciente de sexo femenino de 55 años, con presencia de masa dolorosa en mama derecha. La mastografía demostró una lesión sólida, BI-RADS (Breast Imaging-Reporting and Data System) 4C, sin adenopatías axilares. La biopsia reportó carcinoma ductal infiltrante. Se realizó cirugía conservadora de mama. Los hallazgos histopatológicos fueron compatibles con tumor neuroendocrino de origen gastrointestinal. La tomografía por emisión de positrones/tomografía computarizada (PET/CT) con galio DOTANOC reportó aumento de la captación de radio trazador en yeyuno proximal, con adenopatías adyacentes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Neuroendocrine tumors]]></kwd>
<kwd lng="en"><![CDATA[Metastasis]]></kwd>
<kwd lng="en"><![CDATA[Breast]]></kwd>
<kwd lng="es"><![CDATA[Tumor neuroendocrino]]></kwd>
<kwd lng="es"><![CDATA[Metástasis]]></kwd>
<kwd lng="es"><![CDATA[Mama]]></kwd>
</kwd-group>
</article-meta>
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