<?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>S1870-72032024000100007</article-id>
<article-id pub-id-type="doi">10.35366/114586</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sensibilidad y especificidad de la resonancia magnética con secuencia T1 y medio de contraste en la evaluación del compromiso de la muscular propia en cáncer de recto]]></article-title>
<article-title xml:lang="en"><![CDATA[Sensitivity and specificity of MRI with T1 sequence and contrast medium in the evaluation of muscularis propria involvement in rectal cancer]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avila Perfino]]></surname>
<given-names><![CDATA[María Denise]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez García]]></surname>
<given-names><![CDATA[Angela Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Ladrón de Guevara]]></surname>
<given-names><![CDATA[Paloma]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vadillo Santos]]></surname>
<given-names><![CDATA[Adriana Cecilia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Pérez]]></surname>
<given-names><![CDATA[María de Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Angeles Pedregal  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Angeles Pedregal  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Hospital Angeles Pedregal Departamento de Resonancia Magnética ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2024</year>
</pub-date>
<volume>22</volume>
<numero>1</numero>
<fpage>7</fpage>
<lpage>10</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-72032024000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-72032024000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-72032024000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  la resonancia magnética (RM) es recomendada en la evaluación de pacientes con cáncer de recto. Existe controversia en la utilidad de secuencias T1 con contraste para determinar la penetración del tumor a la pared rectal y fascia mesorrectal.  Objetivo:  determinar la sensibilidad y especificidad de la resonancia magnética con secuencia T1 contrastada para evaluar el compromiso de la muscular propia en cáncer de recto.  Material y métodos:  es un estudio de prueba diagnóstica en pacientes con cáncer rectal confirmado histopatológicamente, con análisis retrospectivo de sus imágenes de resonancia magnética de recto con secuencia T1 contrastada, interpretadas por un observador.  Resultados:  se incluyeron 48 pacientes, 21 mujeres (44%), 27 hombres (56%), edad de 33 a 85 años, media de 57.29 años. Con tumor polipoide en 35 (72%) casos, localizados en tercio medio en 14 (29%). La secuencia T1 contrastada de resonancia magnética identificó involucro de la muscular propia en 12 de los 13 casos con afectación confirmada de la muscular histopatológicamente y obtuvo reporte negativo en 14 de 35 pacientes sin afectación histológica, sensibilidad 92.3%, especificidad 40%, valor predictivo positivo 36.4% y valor predictivo negativo 93.3%.  Conclusión:  la resonancia magnética con secuencia T1 contrastada mostró alto valor predictivo negativo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  magnetic resonance imaging (MRI) is recommended in the evaluation of patients with rectal cancer. Controversy exists regarding the usefulness of contrast-enhanced T1-weighted sequences to determine tumor penetration into the rectal wall and mesorectal fascia.  Objective:  to determine the sensitivity and specificity of contrasted T1-weighted magnetic resonance imaging to assess involvement of the muscularis propria in rectal cancer.  Material and methods:  it is a diagnostic test study in patients with histopathologically confirmed rectal cancer, with retrospective analysis of their rectal magnetic resonance imaging with contrasted T1 sequence, interpreted by an observer.  Results:  48 patients were included, 21 women (44%), 27 men (56%), age 33 to 85 years, mean 57.29 years. With polypoid tumor in 35 cases (72%), located in the middle third in 14 patients (29%). The contrasted T1-weighted magnetic resonance imaging sequence identified involvement of the muscularis propria in 12 of the 13 cases with histopathologically confirmed involvement of the muscle and obtained a negative report in 14 of 35 patients without histological involvement, sensitivity 92.3%, specificity 40%, positive predictive value 36.4 % and negative predictive value 93.3%.  Conclusion:  magnetic resonance imaging with contrasted T1 sequence showed a high negative predictive value.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cáncer]]></kwd>
<kwd lng="es"><![CDATA[recto]]></kwd>
<kwd lng="es"><![CDATA[resonancia magnética]]></kwd>
<kwd lng="es"><![CDATA[muscular propia]]></kwd>
<kwd lng="es"><![CDATA[infiltración]]></kwd>
<kwd lng="es"><![CDATA[contraste]]></kwd>
<kwd lng="en"><![CDATA[cancer]]></kwd>
<kwd lng="en"><![CDATA[rectum]]></kwd>
<kwd lng="en"><![CDATA[magnetic resonance imaging]]></kwd>
<kwd lng="en"><![CDATA[muscularis propria]]></kwd>
<kwd lng="en"><![CDATA[infiltration]]></kwd>
<kwd lng="en"><![CDATA[contrast]]></kwd>
</kwd-group>
</article-meta>
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