Most patients with hemiballism-hemichorea had a vascular lesion in the subthalamic nucleus, usually due to infarction rather than hemorrhage. A 39 year old male who suddenly developed left hemiballism-hemichorea in addition to ipsilateral hemiparesis. The computed tomography (Cf) scan of the brain demonstrated a focal hemorrhage in the contralateral subthalamic nucleus. His involuntary .movement was treated with haloperidol and the symptom compeltely remitted 7 days later. In this report, we present our finding and discuss the possible pathophysiology of the hemiballism-hemichorea.