Abstract
A 45-year-old male with no particular complaints underwent a medical examination. Transnasal upper gastrointestinal endoscopy showed a type IIc tumor, measuring approximately 5 mm in diameter, located on the right posterior wall in the 2nd portion of the duodenum. We performed an endoscopic resection of this lesion, which had been diagnosed as early duodenal cancer. Consequently, the duodenal cancer was successfully resected without any complications, and pathologically curative resection was achieved. There are no reports in the literature of early duodenal adenocarcinoma detected by transnasal endoscopy.
