<prompt> Which of the following causes rib notching on Xray-Coarctation of aortaSVC occlusionModified Blalock Taussing shuntAll of the above  <response>: Ans, is d i.e., All of the above Rib notching o Rib notches are peripheral, sharply circumscribed osteolytic lesion on superior or inferior surface of ribs, o Causes of rib notching ae : - Inferior surface Arterial Coarctation of aortaBilateral Rib notching is seen on the lower border of 3rd to 8th ribs. Rib notching is absent in the 1st 2nd ribs. Rib notching is usually present after the age of 7 years. Aortic thrombosis aortic obstruction or aortitis. Subclavian obstruction after Blalock operation for Fallots tetralogy Taussig Blalock operation. Pulmonary oligemiaPulmonary atresia, TOF, absent pulmonary artery. Venous : - SVC obstruction Arteriovenous: - Pulmonary arteriovenous malformation, chest wall arteriovenous malformation. Neurogenic: - Neurofibromatosis. Superior surface Connective tissue diseases : - SLE, Scleroderma, RA, Sjogrens syndrome. Metabolic : - Hyperparathyroidism Miscellaneous : Neurofibromatosis, Restrictive lung disease, Poliomyelitis, Marfans syndrome, progeria. Osteogenesis imperfecta. 