Prominent somnolence and cerebellar syndrome in subclavian artery thrombosis--a case report.

A patient suffering from acute left subclavian artery thrombosis presented with an unusual syndrome of prominent somnolence, right cerebellar signs, and left upper extremity ischemia. Clinical, angiologic, and electrophysiologic studies confirmed a brain stem and reticular formation dysfunction due to vertebrobasilar ischemia. Urgent thromboembolectomy led to neurologic improvement and satisfactory revascularization of the involved upper limb.