A 67-year-old man presented with a one-month history of poor oral intake and abdominal discomfort. He had a surgical history of gastric antrectomy due to a duodenal ulcer. A physical examination revealed mild distension of the abdomen, but no palpable mass. The serum level of alkaline phosphatase was 260 IU/L (normal range, 40-120 IU/L) and CA19-9 was 994.9 U/mL (normal range, 0-35 U/mL); other...
