抄録
A 56-year-old man was admitted to our hospital because of diabetes mellitus, meanwhile endoscopic examination revealed a elevated lesion at the second portion of the duodenum. The biopsy specimen showed adenoma with severe dysplasia, Endoscopic mucosal resection (EMR) was performed safely with a detacable snare and a bipolar snare. Histological examination revealed a well differentiated tubular adenocarcinoma with depth of invasion into the mucosal layer, and the resected margin were tumor-free.
