A rare cause of gastrointestinal hemorrhage

biliary drainage was performed for suspicion of Mirizzi's 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

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