Pseudoaneurysm of the internal iliac artery is a rare occurrence. Our patient presented with pain over the lower abdomen which also radiated to the back. An Angiogram of the aorta and the iliac arteries showed a pseudoaneurysm of the right internal iliac artery which measured about 8 x 8 cm with a proximal branch of the internal iliac artery distended. Initial efforts of trying to embolize the pseudoaneurysm revealed that there was a connection between the pseudoaneurysm and the interanal iliac vein where foam was getting dislodged into the venous system. Subsequently, we decided to use a vascular plug which has just been recently being introduced. Post procedure there was no more flow into the right internal iliac artery pseudoaneurysm.
Pseudoaneurysms of the subclavian artery are extremely rare lesions despite the overall increase in the frequency of septic pseudoaneurysms caused by illicit parenteral drug abuse. A case of subclavian artery pseudoaneurysm presenting with Horner's syndrome in an intravenous drug user is discussed.