Delayed visualization of the gallbladder with a rim sign. An unusual finding in chronic cholecystitis

The rim sign of increased activity in the gallbladder fossa during nuclear hepatobiliary imaging has been described, with one exception, only in conjunction with a nonvisualizing gallbladder, and it strongly suggests acute complicated cholecystitis. A case is presented in which a rim sign was present despite later visualization of the gallbladder in presumed chronic cholecystitis.