rib notching

rib notch·ing

a smooth defect in the lower border of one or more upper ribs caused by enlarged intercostal collateral vessels, most often a sign of coarctation of the aorta.
Farlex Partner Medical Dictionary © Farlex 2012

rib notching

An abnormal indentation in the inferior margin of the ribs, seen radiographically. It is characteristically identified in people with coarcation of the aorta.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
When confirming a suspected CoA, all patients should have a chest radiograph to assess for rib notching and potential cardiomegaly.
Chest X-ray revealed marked cardiomegaly with a cardiothoracic ratio of 0.68 and pulmonary congestion but there was no rib notching. TTE confirmed a severely dilated left ventricle (left ventricular internal dimension-diastole of 6.9 cm) with severe global systolic dysfunction, moderate concentric left ventricular hypertrophy, bicuspid aortic valve without significant gradient, and an estimated ejection fraction of 25-30%.
In coarctation of the aorta, characteristic rib notching is often present on chest X-ray or CT scan and is indicative of extensive arterial collateral formation bypassing the area of coarctation; a characteristic '3' sign is often also seen on chest X-ray.