Radiology General ea751d99 False about Coarctation of Aorta A Double bulge sign is seen B Double aortic knuckle C Rib notching is seen in 1-8 ribs D Rib notching increases with age High-Yield Explanation Rib notching is absent in 1st and 2nd ribs because first and second intercostal arteries do not take part in Collateral Circulation.