Fig. 1

The ultrasound images of bilateral axillary artery aneurysm. a, b The right giant aneurysm (a without color Doppler; b with color Doppler) without thrombus, with the flow velocity of input and output site of the aneurysm 0.8 m/s and 0.6 m/s respectively; c, d The left giant aneurysm with massive thrombus occlusion (c without color Doppler; d with color Doppler) and sparse blood flow near the mass