acute delusional psychosis
a diagnostic entity specific to French psychiatry, in which it is known as bouffée délirante (French, “delirious outburst”), involving the sudden onset of schizophrenic symptoms in response to a stressful life event. It is temporary (lasting no longer than 3 months), has no strong evidence of a genetic link, and has a favorable prognosis; spontaneous resolution of symptoms is not uncommon. Acute delusional psychosis is essentially equivalent to brief psychotic disorder.