The interrupted rim sign in acute cholecystitis: a method to identify the gangrenous form with MRI.

We present the imaging findings on MR of a patient with acute gangrenous cholecystitis that demonstrated patchy enhancement of the gallbladder mucosa on gadolinium enhanced fat saturated T-1-weighted gradient echo images. This interrupted rim of mucosal enhancement correlated with patchy areas of necrosis and inflammation of the gall bladder mucosa on the histopathological examination.