LAUSR

syndrome and jaundice was significantly improved (Fig. B). Massive bloody stool with hypovolemic shock occurred 5 days later. No abnormalities were observed on esophagogastroduodenoscopy. Colonoscopy revealed a protruding mass with superficial ulceration in the hepatic fracture (Fig. C). What is the most likely diagnosis? Question: An 88-year-old man with a 2-week history of right upper abdominal pain and fever was brought to MacKay Memorial Hospital. Physical examination revealed icteric sclera and tenderness in the right upper quadrant. Laboratory studies showed a white cell count of 21,000/μL and total bilirubin level of 9.1 mg/dL on admission. CT revealed acute calculous cholecystitis (Fig. A). Endoscopic retrograde