A 78-year-old man presented to our hospital with a 1-year history of abdominal distension and constipation. Except for hypertension, he had no documented medical history. Physical examination was unremarkable. Laboratory examination confirmed no abnormality. Although no clues for abdominal distension were found, esophagogastroduodenoscopy demonstrated a large pedunculated duodenal mass with surface erosions.
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