RT Journal Article T1 Psychosis and Dandy-Walker syndrome: a case report and review of the literature. A1 Porras Segovia, Alejandro A1 Guerrero-Jiménez, Margarita A1 Carrillo de Albornoz Calahorro, Carmen Maura A1 Gutierrez-Rojas, Luis K1 cerebellar vermis K1 cerebral ventricles K1 psychotic disorders K1 schizophrenia K1 schizophrenia spectrum and other psychotic disorders AB Dandy-Walker syndrome (DWS) is a group of brain malformations which sometimes present with psychotic symptoms. We present the case of a patient diagnosed with Dandy-Walker variant who presented with schizophrenia-like psychosis. A man in his 30s was admitted to an acute psychiatric unit presenting with persecutory delusions, auditory hallucinations and violent behaviour. The MRI performed showed the typical alterations of Dandy-Walker variant: vermian hypoplasia and cystic dilatation of the fourth ventricle. He also suffered from mild intellectual disability. After being treated with olanzapine 10 mg/d for a month, his psychotic symptoms greatly improved and he was discharged. In conclusion, DWS may cause psychosis through a dysfunction in the circuit connecting prefrontal, thalamic and cerebellar areas. The association between these two conditions may contribute to the understanding of the aetiopathogenesis of schizophrenia. SN 2517-729X YR 2021 FD 2021-04-14 LK http://hdl.handle.net/10668/17736 UL http://hdl.handle.net/10668/17736 LA en DS RISalud RD Apr 6, 2025