[Endoscopic treatment for gastric carcinoid tumor in a patient with type A gastritis complicated with autoimmune polyendocrine syndrome: a case report].

A 42-year-old female developed type 1 diabetes mellitus at the age of 16 years and received insulin therapy. Esophagogastroduodenoscopy revealed an atrophic change localized in the gastric body and a small, protruding gastric lesion. Biopsy revealed that this lesion was gastric neuroendocrine tumor. Hence, the patient underwent en bloc resection by endoscopic submucosal resection with a ligation device. As the patient presented both autoimmune gastritis and type 1 diabetes mellitus, she was diagnosed with type 4 autoimmune polyendocrine syndrome. We report this case considering that only few cases of gastric neuroendocrine tumor with autoimmune gastritis (type A gastritis) complicated with autoimmune polyendocrine syndrome have been reported till date.