<?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>S0026-17422025000200026</article-id>
<article-id pub-id-type="doi">10.22201/fm.24484865e.2025.68.2.03</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Parasitosis delirante y folie à deux: Reporte de psicosis compartida en paciente con deterioro cognitivo vascular]]></article-title>
<article-title xml:lang="en"><![CDATA[Delusional Parasitosis and Folie à Deux: A Case Report of Shared Psychosis in a Patient with Vascular Cognitive Impairment]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz Santos]]></surname>
<given-names><![CDATA[Miguel Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González González]]></surname>
<given-names><![CDATA[César]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Jalisciense de Salud Mental  ]]></institution>
<addr-line><![CDATA[Zapopan Jalisco]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Jalisciense de Salud Mental  ]]></institution>
<addr-line><![CDATA[Zapopan Jalisco]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2025</year>
</pub-date>
<volume>68</volume>
<numero>2</numero>
<fpage>26</fpage>
<lpage>37</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0026-17422025000200026&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0026-17422025000200026&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0026-17422025000200026&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen A continuación, se describe el caso clínico de un hombre de 57 años con folie à deux (FaD), antecedentes de hipertensión arterial sistémica (HAS), consumo perjudicial de alcohol y metanfetaminas, así como deterioro cognitivo leve secundario a enfermedad de pequeños vasos cerebrales. Posteriormente, desarrolló una parasitosis delirante (PD), acompañada de alucinaciones visuales y táctiles complejas, interpretando sensaciones cutáneas aberrantes como una infestación parasitaria. Esta convicción fue compartida con su esposa, quien adoptó la idea delirante a pesar de no presentar alucinaciones. El diagnóstico final incluyó un trastorno neurocognitivo leve con delirios y alucinaciones, asociado a enfermedad de pequeños vasos cerebrales. Tras el tratamiento con aripiprazol, el paciente mostró mejoría parcial de las alucinaciones, aunque la idea delirante persistió.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This report describes the clinical case of a 57-year-old man with folie à deux (FaD), a history of systemic arterial hypertension (SAH), harmful alcohol and methamphetamine use, and mild cognitive impairment secondary to small vessel disease. He subsequently developed delusional parasitosis (DP), accompanied by complex visual and tactile hallucinations, interpreting aberrant skin sensations as a parasitic infestation. This conviction was shared by his wife, who adopted the delusional belief despite not experiencing hallucinations herself. The patient&#8217;s final diagnosis included mild neurocognitive disorder with delusions and hallucinations, associated with small vessel disease. After treatment with aripiprazole, the patient showed partial improvement in his hallucinations, although the delusional belief persisted.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Delirio de parasitosis de Ekbom]]></kwd>
<kwd lng="es"><![CDATA[folie à deux, trastorno psicótico compartido]]></kwd>
<kwd lng="es"><![CDATA[enfermedades de los pequeños vasos cerebrales]]></kwd>
<kwd lng="en"><![CDATA[Ekbom&#8217;s delusion of parasitosis]]></kwd>
<kwd lng="en"><![CDATA[folie à deux]]></kwd>
<kwd lng="en"><![CDATA[shared paranoid disorder]]></kwd>
<kwd lng="en"><![CDATA[cerebral small vessel diseases]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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