Mutism as the presenting symptom: three case reports and selective review of literature.

Mutism, defined as an inability or unwillingness to speak, resulting in an absence or marked paucity of verbal output, is a common clinical symptom seen in psychiatric as well as neurology outpatient department. It rarely presents as an isolated disability and often occurs in association with other disturbances in behavior, thought processes, affect, or level of consciousness. It is often a focus of clinical attention, both for the physician and the relatives. Mutism occurs in a number of conditions, both functional and organic, and a proper diagnosis is important for the management. We hereby present three cases, who presented with mutism as the presenting symptom and the differential diagnosis and management issues related to these cases are discussed. The authors also selectively reviewed the literature on mutism, including psychiatric, neurologic, toxic-metabolic, and drug-induced causes.