A 66-year-old male was pointed out to have abnormalities at the stomach by a barium meal for medical checkup and visited our hospital for further examination. Endoscopic examination revealed an elevated lesion at the second portion of the duodenum.
The biopsy specimen showed adenoma with severe dysplasia. Endoscopic mucosal resection was performed and the Histological examination revealed a well differentiated tubular adenocarcinoma limited within the mucosa.
