[Acute behaviour disorder in a patient with X-linked hydrocephalus with normal pressure].

A 39-year-old patient with severe cognitive impairment and cerebral atrophy due to a hydrocephalus was referred to the psychiatric ward because of an acute behaviour disorder and aggression. The cognitive impairment and gait disorder started after age of 20 in both the patient and in 2 years older than the patient, brother who his meanwhile died. Medical history, the course and current CCT scan favour the diagnosis of an X-linked hydrocephalus with normal cerebrospinal fluid pressure.