Parasitosis delirante y folie à deux: Reporte de psicosis compartida en paciente con deterioro cognitivo vascular

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.