Thrombosed iliac venous aneurysm: a rare form of presentation of a congenital anomaly of the inferior vena cava.

Aneurysms of the iliac veins are extremely rare. We report a case of a 51-year-old male who was admitted for swelling of the lower right limb. Sonography and ascending phlebogram showed a complete occlusion of the right femoropopliteal veins, both iliacs and the inferior vena cava (IVC).