notching

A term referring to small grooves on the inferior face of the ribs, usually the 4th-8th thoracic ribs, seen on a plain film of 70% of older children and adults with uncorrected post-ductal—ductus arteriosus—coarctation of the aorta, due to ‘tracks’ from the pressure of dilated intercostal collateral vessels on the ribs

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notching

Radiology Small grooves on the anterior aspect of ribs seen on a plain CXR of children with post-ductal–ductus arteriosus coarctation of the aorta, due to 'tracks' from the pressure of collateral vessels on the ribs.

McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.