Cystic adventitial disease of the popliteal artery. Report of 1 case and review of the literature.

Cystic adventitial disease (CAD) of the popliteal artery is a rare but well-known cause of intermittent claudication, especially in young patients. The etiology of the disease is still controversial and the literature reports various hypotheses for its origin. Diagnosis starts with thorough history taking and physical examination; non invasive diagnostic studies comprise color duplex scanner (ECD), computed tomography (CT), better if elicoidal (3D CT) and magnetic resonance imaging (MRI), which can aid in establishing correct recognition of the disease in most cases. A 48-year-old man presented with intermittent right calf claudication that had begun 4 months earlier; the symptom-free interval was about 100 m. MRI and MR angiography of right popliteal fossa revealed the presence of an oval cystic (maximum diameter 45 mm). The caudal aspect of the cyst showed pedicles protruding between the popliteal vein and the popliteal artery that compressed the artery, causing complete occlusion of its lumen. Surgery was performed through the posterior approach using an S-shaped incision; the affected segment of the popliteal artery was successfully excised and replaced with an autogenous external saphenous vein graft. A follow-up is underway, both clinical and with; no cyst recurrence has so far been detected either clinically or by duplex scanner during the 15-month postoperative follow-up period; the graft is patent and the patient is completely symptom free. Severe claudication in young patients, possibly without significant vascular risk factors, should prompt the clinical suspicion of adventitial cystic disease of the popliteal artery. Medical history, clinical examination and non invasive instrumental investigations, such as duplex scanner, elicoidal CT and/or MRI, may aid in establishing the correct diagnosis.