Recurrent hydatid pulmonary emboli.

A 30-yr-old healthy male presented with recurrent pulmonary emboli without clinical or radiologic evidence of deep venous thrombosis. He was found to have an isolated hydatid cyst in the pelvis with invasion and thrombosis of the inferior vena cava to the level of the renal veins, which caused recurrent hydatid pulmonary emboli. The patient died because of postoperative intractable respiratory failure.