十二指腸非乳頭部隆起性病変─十二指腸粘膜下腫瘍

A Differential Diagnosis of Duodenal Submucosal Tumors

要旨●十二指腸の粘膜下腫瘍（SMT）は比較的まれであり，組織学的に多彩な疾患が含まれるという特徴がある．通常生検による質的診断が困難であるため，診断には超音波内視鏡（EUS）を含めた内視鏡診断が重要である．本稿では，十二指腸SMTの代表的な症例を提示し，内視鏡診断の特徴，鑑別診断の要点を概説する．

　SMT（submucosal tumors）of the duodenum are relatively rare, and they represent disorders with diverse histological features. These tumors are difficult to qualitatively diagnose using conventional biopsy, endoscopic diagnostic methods, including endoscopic ultrasound, are essential for diagnosis. We report typical cases of duodenal SMT and provide an overview of endoscopic diagnostic features as well as key points in the differential diagnosis of duodenal SMT.