Congenital mirror movements in a child with Chiari type 1 malformation.

A 9-year-old boy presented to the Child Guidance Clinic at the Department of Pediatrics, Medical College, Calicut with abnormal hand movements. He gave history of simultaneous, involuntary movements of the hand associated with voluntary movements of the opposite hand. The involuntary movements were noticed from the first year onwards. There was history of dropping objects in one hand whenever the other hand was moved. He was made fun of by his classmates because writing with the right hand caused similar movements of the left fingers. There was no history of any other neurological symptoms.