<?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>2992-7749</journal-id>
<journal-title><![CDATA[Cirugía de columna (México, Ciudad de México)]]></journal-title>
<abbrev-journal-title><![CDATA[Cir. Columna]]></abbrev-journal-title>
<issn>2992-7749</issn>
<publisher>
<publisher-name><![CDATA[Asociación Mexicana de Cirujanos de Columna A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2992-77492025000300225</article-id>
<article-id pub-id-type="doi">10.35366/120099</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Dermoid cyst of the conus medullaris. Case report]]></article-title>
<article-title xml:lang="es"><![CDATA[Quiste dermoide del cono medular. Reporte de caso]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez López]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez Cisneros]]></surname>
<given-names><![CDATA[Reyna Daena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cuevas Martínez]]></surname>
<given-names><![CDATA[Gustavo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Abrego]]></surname>
<given-names><![CDATA[Leonel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Huato Reyes]]></surname>
<given-names><![CDATA[Raúl]]></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 Morelia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado Hospital Regional Morelia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado Hospital Regional Morelia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado Hospital Regional Morelia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado Hospital Regional Morelia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<volume>3</volume>
<numero>3</numero>
<fpage>225</fpage>
<lpage>229</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2992-77492025000300225&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2992-77492025000300225&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2992-77492025000300225&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  The dermoid cyst is the result of a remnant of ectodermal elements of embryological development, which arises from the trapping of these structures during embryonic closure, the dermoid cyst differs from the epidermoid cyst by its content, of keratin and hair follicles. Mostly located in the infratentorial region and along the middle line, spinal presentation is found in less than 1% of cases of spinal tumors, clinically with signs of medullar compression depending on the level affected.  Clinical case:  Case description 26 years old female with pain in the right pelvic member of six years of evolution, shows progressive claudication, repeated urinary tract infections, and urgent urinary incontinence, in lumbar magnetic resonance observed finding of an extramedullary intradural lesion that covers levels of T12 to L3. The resection of the injury by laminectomy of L1 and L2, finding a cyst with pearl appearance, easily dismissable, almost complete resection was performed, remaining attached to the medullary cone, the histopathological analysis reported mostly keratin. Two days after the procedure, without neurological deficit.  Conclusion:  A dermoid cyst that is localized at the lumbar spine in the medullary cone, is a rare pathology that may start with symptoms of medullar compression and neurological deficit, as well as urinary symptoms. Surgical resection is the treatment of choice and is indicated in most symptomatic cases, however, a total resection can be difficult due to the cyst&#8217;s tendency to adhere firmly to the surrounding nervous structures.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  El quiste dermoide es el resultado de un remanente de elementos ectodérmicos del desarrollo embriológico, que surge del atrapamiento de estas estructuras durante el cierre embrionario, el quiste dermoide se diferencia del quiste epidermoide por su contenido de queratina y folículos pilosos. Localizados principalmente en la región infratentorial y a lo largo de la línea media, la presentación espinal se encuentra en menos del 1% de los casos de tumores espinales, clínicamente con signos de compresión medular dependiendo del nivel afectado.  Caso clínico:  Mujer de 26 años con dolor en miembro pélvico derecho de seis años de evolución, presenta claudicación progresiva, infecciones urinarias de repetición e incontinencia urinaria de urgencia, en resonancia magnética lumbar se observa hallazgo de lesión intradural extramedular que abarca niveles de T12 a L3. Se realizó la resección de la lesión mediante laminectomía de L1 y L2, encontrando un quiste con apariencia perlada, fácilmente descartable, se realizó resección casi completa, quedando adherida al cono medular, el análisis histopatológico reportó mayoritariamente queratina. Dos días después del procedimiento, sin déficit neurológico.  Conclusión:  El quiste dermoide que se localiza en la columna lumbar en el cono medular es una patología rara que puede comenzar con síntomas de compresión medular y déficit neurológico, además de síntomas urinarios. La resección quirúrgica es el tratamiento de elección y está indicada en la mayoría de los casos sintomáticos; sin embargo, una resección total puede resultar difícil debido a la tendencia del quiste a adherirse firmemente a las estructuras nerviosas circundantes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[dermoid cysts]]></kwd>
<kwd lng="en"><![CDATA[spinal canal]]></kwd>
<kwd lng="en"><![CDATA[central nervous system cyst]]></kwd>
<kwd lng="en"><![CDATA[spinal cord neoplasms]]></kwd>
<kwd lng="es"><![CDATA[quistes dermoides]]></kwd>
<kwd lng="es"><![CDATA[canal espinal]]></kwd>
<kwd lng="es"><![CDATA[quiste del sistema nervioso central]]></kwd>
<kwd lng="es"><![CDATA[neoplasias de la médula espinal]]></kwd>
</kwd-group>
</article-meta>
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