Two previously healthy patients were admitted for chest pain, haemopty
sis and dyspnoea. Perfusion-ventilation lung scanning demonstrated pul
monary embolism. Lower extremity duplex imaging and contrast venograph
y revealed a thrombosed popliteal vein aneurysm as the source of embol
i. After immediate anticoagulant therapy, the thrombo-embolic source w
as excluded by aneurysmectomy with lateral venography in the first pat
ient. The second patient was treated by anticoagulants and percutaneou
s vena cava inferior filter placement to prevent recurrent pulmonary e
mbolism. Anatomopathological findings, possible origin, diagnostic mod
alities and medical and surgical treatment of popliteal vein aneurysm
are discussed.