Commonest cause of Budd Chiary syndrome is:: (A) Valve in the IVC, (B) Hepatocellular carcinoma, (C) Paroxysmal nocturnal hemoglobinuria, (D) Renal cell carcinoma
Answer is C. Answer is C (Paroxysmal nocturnal hemoglobinuria): The most common cause of hepatic vein thrombosis from the list mentioned in Harrison is Paroxysmal nocturnal hemoglobinuria, and hence is the answer of choice here.