Post-traumatic psychoses.

The incidence of post-traumatic psychoses can be appraised as 3-4 per cent in the adults who suffered a head injury. Post-traumatic psychoses appear as not directly provoked by the head injury but rather as precipitated by it, usually in young male patients with previous psychological disturbances which were more or less compensated formerly. In half the cases, the psychosis described as an acute delusional state totally disappears after a few days or weeks.