Aneurysm of the internal iliac vein as a rare source of pulmonary thromboembolism.

This is the first reported case of internal iliac vein aneurysm, manifested by recurrent pulmonary embolism. The case emphasizes the importance of searching for unusual sources of unexpected and unexplained pulmonary emboli. Venous aneurysms may have various manifestations and sequelae. Antecedent trauma and arteriovenous fistulas should be excluded.