2022 Volume 64 Issue 4 Pages 1011-1017
A 63-year-old man showed a duodenal elevated lesion on esophagogastroduodenoscopy, which was suspected to be an adenocarcinoma or adenoma on the basis of endoscopic findings. He was subsequently referred to our hospital for further examination and treatment. Endoscopic ultrasonography showed a hypoechoic area inside the tumor. The tumor was located on the second part of the duodenum and had a depression on its lateral side. On the basis of these findings, the patient underwent endoscopic mucosal resection. Histological examination of the resected specimen revealed that the depressed area was a tubular adenoma, and the luminal side of the duodenum and cystic area shared muscularis mucosae. The lesion was eventually diagnosed as duodenal duplication or intraluminal duodenal diverticulum with tubular adenoma. Although extremely rare, these diseases should be considered in the differential diagnosis of duodenal elevated lesions.
