Clinical Presentation

A 51-year-old man presents with swelling in the left groin 2 days after catheterization of the left common femoral artery.

(A) Computed tomographic angiography (CTA) shows a pseudoaneurysm of the left common femoral artery (CFA: arrow). (B) Color Doppler shows “yin-yang” appearance of the pseudoaneurysm (arrow). The common femoral artery is also shown (arrowhead). (C) Grayscale image shows a 22-gauge needle in the center of the pseudoaneurysm (arrow). (D) Color Doppler after thrombin injection shows cessation of flow in the pseudoaneurysm (arrow). The common femoral artery retains flow (arrowhead).

Differential Diagnosis

• Pseudoaneurysm of the common femoral artery: Indicated by the “yin-yang” color Doppler appearance of the saccular structure.

Essential Facts