<?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>2631-2581</journal-id>
<journal-title><![CDATA[Revista Ecuatoriana de Neurología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Ecuat Neurol]]></abbrev-journal-title>
<issn>2631-2581</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Médica Ecuatoriana de Neurología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2631-25812019000100085</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Agenesia De La Arteria Carótida Interna: Presentación De Dos Casos Y Revisión De La Literatura]]></article-title>
<article-title xml:lang="en"><![CDATA[Agenesis Of The Internal Carotid Artery: Presentation Of Two Cases And Review Of The Literature]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Silva]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chiquete-Anaya]]></surname>
<given-names><![CDATA[Erwin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cantú-Brito]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Córdova-López]]></surname>
<given-names><![CDATA[Patricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Departamento de Neurología y Psiquiatría Clínica de Enfermedad Vascular Cerebral]]></institution>
<addr-line><![CDATA[Salvador Zubirán Ciudad de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>28</volume>
<numero>1</numero>
<fpage>85</fpage>
<lpage>88</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_arttext&amp;pid=S2631-25812019000100085&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_abstract&amp;pid=S2631-25812019000100085&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_pdf&amp;pid=S2631-25812019000100085&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: Se presentan dos casos de pacientes con agenesia de arteria carótida interna izquierda, el primer caso con síntomas de glaucoma de ángulo abierto y catarata ipsilateral y el segundo caso de una paciente con cefalea tensional, así como una revisión de la literatura debido a la baja frecuencia de esta anomalía del desarrollo.  Casos clínicos: caso 1: Se trata de mujer de 66 años con trastornos visuales asociados a catarata y glaucoma en quien por sospecha de fístula carotídea cavernosa se documentó una agenesia de carótida interna izquierda, con colateralidad a través del sistema posterior; caso 2: paciente de 58 años de edad con cefalea tensional la cual se realizó una IRM donde se documenta la agenesia de la arteria carótida izquierda, segmentos del C3 al C7.  Conclusión: Las anormalidades en el desarrollo del sistema carotídeo ocurren tempranamente en la embriogénesis. En relación al momento en que ocurre la alteración se han descrito diferentes patrones circulatorios. Es posible que la presencia de circulación colateral sea la razón de que la mayoría de los casos sean reportados asintomáticos desde el punto de vista neurológico vascular. A pesar de ser una entidad rara, se debe conocer para poder diferenciarla de otras afecciones y vigilar la aparición de complicaciones asociadas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Two cases of patients with left internal carotid artery agenesis are presented, the first case with symptoms of open angle glaucoma and ipsilateral cataract and the second case of a patient with tension headache, as well as a review of the literature due to the Low frequency of this development anomaly.  Clinical cases:  case 1, A 66-year-old woman with visual disorders associated with cataract and glaucoma in whom, due to suspicion of a carotid fistula, a left internal carotid agenesis was documented, with collaterality through the posterior system, case 2, patient A 58-year-old man with tension headache underwent an MRI where the agenesis of the left carotid artery, segments from C3 to C7, was documented.  Conclusion:  Abnormalities in the development of the carotid system occur early in embryogenesis. In relation to the moment in which the alteration occurs, different circulatory patterns have been described. It is possible that the presence of collateral circulation is the reason that the majority of cases are reported asymptomatic from the vascular neurological point of view. Despite being a rare entity, it must be known in order to differentiate it from other conditions and monitor the appearance of associated complications.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[agenesia]]></kwd>
<kwd lng="es"><![CDATA[carótida.]]></kwd>
<kwd lng="en"><![CDATA[agenesis]]></kwd>
<kwd lng="en"><![CDATA[carotid]]></kwd>
<kwd lng="en"><![CDATA[left.]]></kwd>
</kwd-group>
</article-meta>
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