Catatonia is a neuropsychiatric syndrome that appears in medical, neurological or psychiatric conditions. There are presentation variants: “malignant catatonia” (MC) subtype shares many characteristics with the neuroleptic malignant syndrome (NMS), possibly reflecting common pathophysiology.

We present a clinical vignette and review the literature available on online databases about MC/NMS.

We present a man, 41-years-old, black ethnicity, with no relevant medical history. He had two previous episodes compatible with brief psychosis, the last one in 2013, and a history of adverse reactions to low doses of antipsychotics. Since the last episode he was asymptomatic on olanzapine 2.5 mg id. He acutely presented to the Emergency Room with mutism, negativism, immobility and delusional speech, similar to the previous episodes mentioned and was admitted to a psychiatric infirmary, where his clinical condition worsened, showing muscle rigidity, hemodynamic instability, leukocytosis, rhabdomyolysis and fever. Supportive care was provided, olanzapine was suspended and electroconvulsive therapy (ECT) was initiated. After two months, he was discharged with no psychotic symptoms. He is still under ECT and no antipsychotic medication was reintroduced.

Many studies suggest that clinical or laboratory tests do not distinguish MC from NMS and that they are the same entity. These two conditions are life-threatening and key to treatment is a high suspicion level. There is no specific treatment; supportive care and stopping involved medications are the most widely used measures. ECT is a useful alternative to medication.

The authors have not supplied their declaration of competing interest.