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要旨●患者は60歳代,男性.腹痛を主訴に前医にて下部消化管内視鏡検査(CS)を施行され,直腸に病変を認め,当科に紹介となった.当科のCSでは,直腸S状部に20mm大の0-IIa型病変を認め,拡大内視鏡観察では全体に鋸歯状構造を呈する病変が認められ,II型pitの平坦隆起領域を主体とし中央部の鋸IV型pit部が観察された.何らかの腫瘍としての性質を有する鋸歯状病変と判断し,診断的治療として内視鏡的粘膜下層剝離術(ESD)を施行した.病理組織像は,II型pit部では腫瘍腺管表層部に鋸歯状構造を認め,腺管中部〜底部では低異型度腺腫相当の直線状の管状腺管が認められた.病変中央の鋸IV型pit部は,表層の乳頭状の増殖を認める以外はII型pit部と類似の病理組織像を呈し,SuSA(superficially serrated adenoma)と診断した.
We report on a case of SuSA(superficially serrated adenoma). A man in his 60s was admitted to our hospital for a rectal lesion. Colonoscopy revealed a 20mm white, flat, elevated lesion in the rectosigmoid colon. Under magnifying endoscopy using crystal violet staining, the main flat elevated part showed a II pit pattern, and the central part showed a serrated type IV pit pattern. We histologically diagnosed SuSA, which consisted of straight adenomatous glands and showed serration in the superficial layer. Genetic analysis was performed, and the results were as follows:BRAF mutation negative, KRAS mutation positive, and TP53 negative, with low CIMP(CpG island methylator phenotype), unmethylated MLH1, and methylated SMOC1(secreted modular calcium-binding protein 1).
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