<prompt> Inferior rib notching is seen in -Coarctation of aortaSLERAScleroderma  <response>: Ans. is a i.e., Coarctation of aorta Rib notchingo Rib notches are peripheral, sharply circumscribed osteolytic lesion on superior or inferior surface of ribs,o Causes of rib notching ae : -Inferior surfaceArterialCoarctation 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 obstructionArteriovenous: - Pulmonary arteriovenous malformation, chest wall arteriovenous malformation.Neurogenic: - Neurofibromatosis.Superior surfaceConnective tissue diseases : - SLE, Scleroderma, RA, Sjogrens syndrome.Metabolic : - HyperparathyroidismMiscellaneous : Neurofibromatosis, Restrictive lung disease, Poliomyelitis, Marfans syndrome, progeria. Osteogenesis imperfecta. 