[Orbitofrontal syndrome in psychiatry].

Orbitofrontal syndrome is a variant of frontal lobe syndrome in which behavioural disturbances are prevailing. It results from bilateral lesions of the orbitofrontal cortex and the medial face of frontal lobe. Patients present disorganized hyperactivity. They are distractable, impulsive, euphoric and unable to abide by social rules. They often have instinctive disinhibition (hypersexuality, hyperphagia and urinary behaviour disorders). In spite of severe behavioural disturbances cognitive functions are often intact so that orbitofrontal syndrome may be confounded with two psychiatric disorders: mania (or hypomania) and antisocial personality disorder. In this article we present a case report of orbitofrontal syndrome which was initially misdiagnosed as mania. Clinical features and possible modes of presentation of this syndrome are discussed. It is suggested that serotonin reuptake inhibitors may be of some use in this disorder.