[Case report: Mirizzi syndrome in a patient with emphysematous cholecystitis: ultrasonographic and computed tomographic findings].

Mirizzi syndrome is a very uncommon cause of extrahepatic bile duct obstruction. A stone impacts in the cystic duct or gallbladder neck and causes extrinsic compression and obstruction of the common hepatic duct, aided by a local inflammatory process. Preoperative diagnosis is very important because of the potential risk of bile duct injury during surgery and the local inflammatory process may suggest cholangiocarcinoma. Infection by specific coliform organisms may result in emphysematous cholecystitis in patients with diabetes or those who are immunosuppressed, with mural air being visible. Herein, we report an emphysematous cholecystitis associated with Mirizzi syndrome in a patient with diabetes mellitus.