Resumen

RUIZ SANTOS, Miguel Alejandro  y  GONZALEZ GONZALEZ, César. Delusional Parasitosis and Folie à Deux: A Case Report of Shared Psychosis in a Patient with Vascular Cognitive Impairment. Rev. Fac. Med. (Méx.) [online]. 2025, vol.68, n.2, pp.26-37.  Epub 20-Jun-2025. ISSN 2448-4865.  https://doi.org/10.22201/fm.24484865e.2025.68.2.03.

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’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.

Palabras llave : Ekbom’s delusion of parasitosis; folie à deux; shared paranoid disorder; cerebral small vessel diseases.

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