Fig. 12. Superficial femoral artery pseudoaneurysm on color Doppler ultrasound and contrast-enhanced ultrasonography (CEUS).

A. Color Doppler ultrasonography (US) shows partial filling of the pseudoaneurysm along with its connection with the vessel of origin. The cavity of the pseudoaneurysm is partially filled with an echogenic thrombus. Color flow reversal is noted, giving rise to a "yin-yang" appearance. Overwriting artifacts obscure the fistulous neck of the pseudoaneurysm. B. A CEUS image shows filling of the patent part of the pseudoaneurysm and accurately delineates its neck. C, D. After thrombin injection, color Doppler US (C) and CEUS (D) show absence of blood flow within the successfully treated pseudoaneurysm. CFA, common femoral artery.