In coarctation of aorta, site of rib notching is?
Superior to rib
Inferior to rib
At sternum
At Vertebra
Ans. (b) Inferior to ribCauses of inferior rib notchingCauses of superior rib notching* Arterial: aortic coarctation, aortic thrombosis, pulmonary- oligemia/AV malformation, Blalock Taussig shunt, Tetralogy of fallot, absent pulmonary artery and pulmonary stenosis.* Venous: AV Malfomations of chest wall, superior vena cava or other central venous obstruction.* Neurogenic: Intercostal neuroma, Neurofibromatosis type 1, poliomyelitis.* Osseous: Hyperparathyroidism, Thalassemia* Poliomyelitis* Osteogenesis Imperfecta* Neurofibromatosis* Marfan's Syndrome* Collagen vascular disease* Hyperparathyroidism.
Diseases of the Aorta