Figures 6. Emphysematous cholecystitis in a 49-year-old man with diffuse abdominal pain. Anterior scintigram from a hepatobiliary study shows a region of increased hepatic activity (arrows) adjacent to the relatively photopenic gallbladder fossa (g) (rim sign). The gallbladder itself is not visualized. Normal bowel activity is present (b). (Fig 6 courtesy of Yong Bradley, MD, Brook Army Medical Center, San Antonio, Texas.)