Superior rib notching is/are caused by – a) Hyperparathyroidismb) Poliomyelitisc) Blalock tausing shuntd) Marfan syndromee) Coarctation of aorta: (A) acd, (B) bcd, (C) abc, (D) abd
Answer is D. Hyperparathyroidism, poliomyelitis and Marfan's syndrome cause notching of superior surface of rib.