<?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>0026-1742</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina (México)]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Med. (Méx.)]]></abbrev-journal-title>
<issn>0026-1742</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0026-17422025000100034</article-id>
<article-id pub-id-type="doi">10.22201/fm.24484865e.2025.68.1.06</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Localización atípica de linfoma primario de sistema nervioso central en región selar Reporte de un caso y revisión de la literatura]]></article-title>
<article-title xml:lang="en"><![CDATA[Atypical Localization of Primary Central Nervous System Lymphoma in the Sellar Region. Case Report and Literature Review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lay Wong del Pino]]></surname>
<given-names><![CDATA[Andrea Mei]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez Nieves]]></surname>
<given-names><![CDATA[José Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado Hospital Regional General Ignacio Zaragoza ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2025</year>
</pub-date>
<volume>68</volume>
<numero>1</numero>
<fpage>34</fpage>
<lpage>37</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422025000100034&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422025000100034&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422025000100034&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El linfoma primario del sistema nervioso central (LPSNC) -no Hodgkin- tiene su origen en cerebro, ojo, leptomeninges o medula espinal, sin encontrar evidencia de linfoma sistémico al momento del diagnóstico. El LPSNC se considera una neoplasia maligna rara que comprende del 0.85% al 2% de todos los tumores cerebrales primarios, de localización más común en la región periventricular de los ventrículos laterales; la mayoría son supratentoriales, del 50% al 70% de los casos. Los subtipos histopatológicos más comunes que se pueden observar en el sistema nervioso central son los linfomas de células B grandes. Para el diagnóstico definitivo es necesario una biopsia para obtener una confirmación histopatológica e inmunohistoquímica y con ello seleccionar un tratamiento específico. Se utiliza la quimioterapia y radioterapia como tratamiento principal, presentando en la mayoría de los casos recaída en el primer año, del 15% al 20%, con una supervivencia general de 5 años a partir del diagnóstico, ya que el tratamiento neuroquirúrgico muchas veces no se puede realizar por la localización del linfoma. Se presenta el caso de un paciente masculino de 55 años que inicia de forma súbita con parálisis completa del tercer nervio craneal derecho y alteraciones en la visión periférica, por lo que se inició protocolo de estudio y, por las características imagenológicas por resonancia magnética de encéfalo y clínicas, se manejó como un macroadenoma hipofisiario realizando exéresis de la lesión mediante abordaje transesfenoidal endoscópico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Primary central nervous system lymphoma (PCNSL) -non-Hodgkin- originates in the brain, eye, leptomeninges, or spinal cord without evidence of systemic lymphoma at the time of diagnosis. PCNSL is considered a rare malignant neoplasm, comprising 0.85% to 2% of all primary brain tumors, most commonly located in the periventricular region of the lateral ventricles; the majority are supratentorial in 50% to 70% of cases. The most common histopathological subtypes observed in the central nervous system are large B-cell lymphomas. For a definitive diagnosis, a biopsy is necessary to obtain histopathological and immunohistochemical confirmation, enabling the selection of specific treatment. Chemotherapy and radiotherapy are used as the primary treatments, with relapse occurring in 15% to 20% of cases within the first year and an overall 5-year survival rate from diagnosis, as neurosurgical treatment is often not feasible due to the lymphoma&#8217;s location. A case is presented of a 55-year-old male patient who suddenly developed complete paralysis of the right third cranial nerve and peripheral vision disturbances. A diagnostic protocol was initiated, and due to brain MRI and clinical characteristics, the case was managed as a pituitary macroadenoma. The lesion was excised via an endoscopic transsphenoidal approach.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Linfoma]]></kwd>
<kwd lng="es"><![CDATA[sistema nervioso central]]></kwd>
<kwd lng="es"><![CDATA[región selar]]></kwd>
<kwd lng="es"><![CDATA[atípico]]></kwd>
<kwd lng="es"><![CDATA[linfoma primario]]></kwd>
<kwd lng="en"><![CDATA[Lymphoma]]></kwd>
<kwd lng="en"><![CDATA[central nervous system]]></kwd>
<kwd lng="en"><![CDATA[sellar región]]></kwd>
<kwd lng="en"><![CDATA[atypical]]></kwd>
<kwd lng="en"><![CDATA[primary lymphoma]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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