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Wednesday, January 4, 2023

SILHOUETTE SIGN

The phenomenon of the loss of the normal radiographic silhouette (contour) when two substances of the same density are in direct contact is called Silhouette sign.

Right heart border  silhouette sign- RML lesion

Left heart border silhouette sign - Lingular lesion

Descending Aorta and Left Diaphragm - Left lower lobe

Right Diaphragm- Right Lower lobe

Upper Right tracheal lung interface  and Ascending Aorta- Right Upper lobe

Left atrium ,aortic knuckle,Upper Left tracheal lung interface - Left Upper lobe


Reference: Felson’s Principles of Chest Roentgenology ,5th edition

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