Question: A 71-year-old woman with hypertension and dyslipidemia was referred to our hospital because of a high level of carbohydrate antigen (CA) 19-9 of 85 U/mL. She was asymptomatic and had no findings on physical assessment or blood tests, except a high CA19-9 level. Computed tomography scan and colonoscopy showed no evidence of malignancy. Esophagogastroduodenal endoscopy found atrophic gastritis and reddish, flat, elevated lesions with erosion on the anterior wall of the lower gastric body (Figure A).