The most common source of pulmonary embolism is:: (A) Amniotic fluid embolism, (B) Calf vein thrombi, (C) Large veins of leg, (D) Cardio thoracic surgery
Answer is C. Answer is C (Large veins of leg): About half the patients with pelvic vein thrombosis or proximal leg deep vein thrombosis have pulmonary thromboembolism. Isolated calf vein thrombosis pose a lower risk of pulmonary embolism- Harrisons