Transient upper monoballism in the presence of contralateral chronic subdural hematoma

A case of chronic subdural hematoma associated with contralateral upper monoballism is reported. Intracranial midline shift and transtentorial herniation of the ipsilateral temporal lobe were the only demonstrated CT abnormalities. Complete neurological recovery followed the evacuation of the hematoma. Direct mechanical injury caused by the marked brain compression and distortion, and transient ischemic changes within cerebral areas whose damages may result in ballism, may be considered important causative factors of such an unusual neurological complication.