Rabbit syndrome: An idiopathic case with tongue tremor.

ABSTRACT

A 50 year old man presented with mouth and tongue tremor for 6 months. He lead no previous exposure to any narcoleptic drugs. Physical examination revealed healthy except abnormal movement of his mouth and tongue without any signs of parkinsonism. Investigations s howled normal blood chemistry profile, chest radiography, electrocardiography and electro encephalopathy. Benztropine 2 milligram three times a day was prescribed for him and he responded dramatically within a few days and all symptoms were disappeared within two weeks. He was a regular attendant to our Movement Disorder Clinic at Siriraj Hospital for 4 consecutive years without any evidence of parkinsonism signs. He once stopped medication by his own for 2 weeks and movement disorder of rabbit syndrome recurred but all his symptoms were controlled after read ministration of benztropine. This is the first report of rabbit syndrome in Thailand with spontaneous occurring and tongue tremor. Now only 30 reported cases were in the world literature.