Brief episodes of non-specific psychosis later diagnosed as periodic catatonia.

A 73-year-old woman was known to have discrete episodes of psychosis not otherwise specified that would require a brief admission to hospital and total remission following a short course of benzodiazepine or antipsychotic treatment. She had no underlying schizophrenic or affective disorder and was completely unimpaired in between episodes, which could last several years. She presented to us with psychotic symptoms but also noted to have many catatonic features, which were also present on previous presentations. Following failure with antipsychotic trials on this index presentation, she completely remitted with a short course of electroconvulsive therapy. We discuss the importance of identifying and treating catatonia and the lesser-known variant of periodic catatonia. Current presentations should always take into account the lifetime context of psychiatric illness. Rarely do patients with primary psychotic disorders not have any impairment or treatment in between episodes. 2016 BMJ Publishing Group Ltd.