Using Doppler ultrasound, we detected 59 patients with aneurysm, 54 cases were confirmed by angiography or operation or both. Among them, 33 cases (63%) showed true aneurysm, 18 cases (33%) pseudoaneurysm, and 2 cases (4%) superficial congenital arterio-venous aneurysm. Eight cases were associated with dissected stripping. One case was falsely diagnosed by ultrasonography. The diagnostic accuracy was 98%. The results suggest that color Doppler ultrasonography is useful in detecting aneurysm.