臨牀消化器内科 Vol.26 No.12(3-1)


特集名 内視鏡で遭遇する大腸隆起型および表面型病変を見直す
題名 鋸歯状病変の特徴と診断 (1) 病理の立場から
発刊年月 2011年 11月
著者 原岡 誠司 福岡大学筑紫病院病理部
著者 岩下 明德 福岡大学筑紫病院病理部
【 要旨 】 大腸鋸歯状病変(serrated polyp)とは,組織学的に上皮の鋸歯状構造を有するポリープのことで,過形成性ポリープ(HP),鋸歯状腺腫(SA),sessile serrated adenoma(SSA)に大別される.SAはHPに類似した鋸歯状構造を有するが,腫瘍性細胞異型・構造異型を示す病変である.SSAは従来HPに含まれていた病変で,右側結腸に好発し,腺管の構造異常や細胞増殖帯の異常などの組織学的特徴を示す.これらの鋸歯状病変を前駆病変とする,serrated neoplasia pathwayが散発性microsatellite instability(MSI)大腸癌の発癌に関与していると考えられている.
Theme Reappraisal of Colorectal Protruded and Flat Lesions Which are Encountered During Endoscopy
Title Pathological Characteristics and Diagnosis of Serrated Colorectal Polyps
Author Seiji Haraoka Department of Pathology, Fukuoka University Chikushi Hospital
Author Akinori Iwashita Department of Pathology, Fukuoka University Chikushi Hospital
[ Summary ] A group of serrated polyps in the colorectum may be characterized histologically by serrated architecture, and may include hyperplastic polyps, serrated adenomas, and sessile serrated adenomas (SSA). Serrated adenomas demonstrate serrated crypt architecture, similar to hyperplastic polyps. They may also exhibit neoplastic cytologic and architectural atypia. SSAs were previously considered to be large variant lesions associated with hyperplastic polyps and characterized by abnormal proliferation, as well as architectural distortion. Serrated polyps are thought to be precursor lesions for sporadic microsatellite unstable carcinoma developing via serrated neoplasia pathways.
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