<?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>0035-0052</journal-id>
<journal-title><![CDATA[Revista mexicana de pediatría]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. pediatr.]]></abbrev-journal-title>
<issn>0035-0052</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Pediatría A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-00522022000400158</article-id>
<article-id pub-id-type="doi">10.35366/109591</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Recién nacido sano con una arteria única y nudo verdadero en el cordón umbilical]]></article-title>
<article-title xml:lang="en"><![CDATA[Healthy newborn with a single artery and a true knot in the umbilical cord]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina-Gaona]]></surname>
<given-names><![CDATA[Lourdes Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Neira-Maguey]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico y de Estudios Superiores de Monterrey  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro Médico ABC  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>89</volume>
<numero>4</numero>
<fpage>158</fpage>
<lpage>161</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-00522022000400158&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-00522022000400158&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-00522022000400158&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  el cordón umbilical se caracteriza por tener dos arterias y una vena; la presencia de arteria única es la anomalía más frecuente, pero es una condición muy rara, lo mismo sucede con la presencia de un nudo verdadero. Presentamos a un recién nacido (RN) en quien se identificaron ambas condiciones al momento del nacimiento.  Reporte de caso:  recién nacido masculino de 38.3 semanas de gestación, madre de 29 años con antecedente de dos abortos. El neonato se obtiene por cesárea, con un peso de 3,030 gramos, Apgar 9/10. En la exploración física el cordón umbilical se encuentra con una sola arteria y una vena, además de la presencia de un nudo verdadero; no se detectó alguna malformación mayor. Se realizó ultrasonido renal que fue normal.  Conclusión:  es extraordinaria la presencia de una arteria única junto a un nudo verdadero en el cordón umbilical; sin embargo, estos hallazgos no necesariamente significan que el RN tenga alguna otra malformación congénita o repercusión clínica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  the umbilical cord is characterized by having two arteries and one vein; the presence of a single artery is the most frequent anomaly, but it is a very rare condition, the same happens when there is a true knot. We present a newborn in whom both conditions were identified at birth.  Case report:  this patient is a male newborn with 38.3 weeks of gestation. His mother was 29 years-old with a history of two abortions. He was born by cesarean section, with a weight of 3,030 grams, and Apgar 9/10. On physical examination, the umbilical cord had only one artery, one vein, as well as the presence of a true knot. No major malformation was detected. Renal ultrasound was normal.  Conclusion:  the association of a single artery together with a true knot in the umbilical cord is extraordinary. These findings do not necessarily mean that the newborn has congenital malformation or clinical condition.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cordón umbilical]]></kwd>
<kwd lng="es"><![CDATA[nudo verdadero]]></kwd>
<kwd lng="es"><![CDATA[arteria umbilical única]]></kwd>
<kwd lng="es"><![CDATA[recién nacido]]></kwd>
<kwd lng="en"><![CDATA[umbilical cord]]></kwd>
<kwd lng="en"><![CDATA[true knot]]></kwd>
<kwd lng="en"><![CDATA[single umbilical artery]]></kwd>
<kwd lng="en"><![CDATA[newborn]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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