Idiopathic paroxysmal choreoathetosis--report of 2 cases and review of literature.

H.B.a. is a 24-years-old right-handed married Malay clerk. She was first seen in March 1982 complaining of recurrent attacks of spasm involving left side of limbs, body and face since early 1979. The attacks came 4 to 5 times per day and each episode lasted 5 to 10 seconds. Each attack started with current-like sensation in the left foot ascending to the trunk lasting a fraction of a second. This was followed by progressive plantar flexion and inversion of left foot with flexed toes and partial flexion at the knee. In the upper limb there was partial flexion of fingers at carpometacarpal joints with extension at interphangeal joints, adducted thumb and progressive supination of forearm. The elbow was partially flexed and the arm was