Silhouette Sign on Chest X-Ray Loss of the margin between two opposing structures of the same radiographic density - Allows localization by lobe • RUL – right paratracheal stripe • RML – right heart border • RLL – right hemidiaphragm • LUL – aortic arch • Lingula – left heart border • LLL – left hemidiaphragm #Silhouette #Sign #ChestXRay #CXR #diagnosis #radiology #localization
