Commonest cause of pulmonary embolism is -
Ans. is 'a' i.e., Thrombosis of leg veins Thrombi in deep vein of the leg accounts for more than 95% of cases of pulmonary embolism. The most common source of emboli are DVT of femoro-popliteal and iliac veins. But remember that : - Most common site of DVT is calf veins (Calf veins thrombosis are itself associated with a low risk for embolism, but when the thrombosis progresses proximally to involve the larger veins above knee, then the risk becomes very high.
Thrombosis of leg veins
Thrombosis of prostatic veins
IVC thrombosis
Thrombosis of internal pudendal aery