Popliteal vein aneurysm in a teenager with knee swelling.

Primitive vein popliteal aneurysms are rare and potentially fatal vascular disorders. The most dangerous complications of popliteal vein aneurysms are thromboembolic events, mainly pulmonary embolisms, a life-threatening event that requires a timely diagnosis and prompt management. As a treatable cause of recurrent pulmonary embolisms, their actual incidence is believed to be underestimated. Herein, we present a case report of a popliteal vein aneurysm in a previously healthy16-year old male, presenting with a swelling behind his left knee that causes minimal discomfort while walking. When feasible, early surgical repair of both symptomatic and asymptomatic popliteal venous aneurysms is advised, since they are associated with an ill-defined possibility of pulmonary embolism and mortality, if left untreated.