ABSTRACT
Behcet's disease is generally recognized as a chronic multi-system disease. Approxymately 8% of patients with Behct's disease will have serious vascular compilcations which is called vasculo-Behcet's disease. A male patient of 41 year old was admitted to our clinic, complaining pain of left popliteal fossa and hypesthesia of left lower leg. A popliteal aneurysm was found. Resection of the aneurysm and a saphenous vein graft were successfully performed. Neuropathy disappeared after the surgery. Aneurysms in Behcet's disease mainly appear in major arteries, and rarely in peripheral arteries. Compression neuropathy in the popliteal aneurysm of Behcet's disease has been rarely reported. Early resection of aneurysm before completion of neuropathy is recommended for succsessful outcome.