[Unusual cause of pulmonary embolism].

Aneurysms of popliteal veins are a rare but silent danger that may involve pulmonary embolism. This case report is of a 63-year-old woman with a venous aneurysm of the left popliteal vein who suffered pulmonary embolism twice during treatment with phenprocoumon. Three days after resection she suffered an embolism of the left popliteal vein. Follow-up at 12 months with duplex showed no signs of thrombosis.