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Patient 5. (A) Several small sessile tubular adenomas in the gastric antrum of a 39-year-old male patient with familial adenomatous polyposis (arrows). The adenomas have a flat-topped, villiform appearance. (B) A photomicrograph of a gastric adenoma from this patient demonstrates a tubular adenoma with low grade dysplasia, characterized by nuclear hyperchromasia and glandular crowding (H&E stain, magnification × 100).
