Inferior rib notching is present in

Causes of rib notching ae: - A) Inferior surface 1) Arterial i) Coarctation of aorta Bilateral Rib notching is seen on the lower border of 3 rd to 8th ribs. Rib notching is absent in the 1st & 2nd ribs. Rib notching is usually present after the age of 7 years. ii) Aortic thrombosis (aortic obstruction) or aortitis. iii) Subclavian obstruction after Blalock operation for Fallot’s tetralogy (Taussig Blalock operation). iv) Pulmonary oligemia Pulmonary atresia, 1)TOF, absent pulmonary artery. 2) Venous : - SVC obstruction 3) Arteriovenous : - Pulmonary arteriovenous malformation, chest wall arteriovenous malformation. 4) Neurogenic : - Neurofibromatosis. B) Superior surface 1) Connective tissue diseases: - SLE, Scleroderma, RA, Sjogren’s syndrome. 2) Metabolic : - Hyperparathyroidism 3) Miscellaneous : - Neurofibromatosis, Restrictive lung disease, Poliomyelitis, Marfan’s syndrome, progeria, Osteogenesis imperfecta.