Rim sign in radiology

What is the Rim sign in radiology, and what does it imply?

The “rim” sign refers to an area of increased radiotracer activity in the region of the liver surrounding the gallbladder. The implication is that there is hyperemia or inflammation associated with acute cholecystitis. This hyperemia appears as a rim of increased radiotracer activity immediately adjacent to the gallbladder. The diagnosis of acute cholecystitis still depends, however, on nonvisualization of the gallbladder.


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