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要旨●CSPの病理学的特徴は明らかでないことも多い.今回の検討は大腸ポリープ646病変(CSP群198病変,EMR群448病変)を比較検討することで,CSPの摘除標本の病理学的特徴を明らかにした.断端評価困難もしくは陽性の割合はCSP群57%,EMR群40%であり,吸引分裂と,深部断端評価困難もしくは陽性(VMX/+)がCSP群で有意に高率であった.また,CSPの切除層は粘膜筋板が83%であり,VMX/+のリスク因子は鋸歯状病変であった.CSPの病理学的特徴を理解したうえで,CSPの適用を決めるべきである.
Histological features of CSP(cold snare polypectomy)specimens are not well known. This study aimed to clarify the histological cut end and the resection layer between CSP and EMR(endoscopic mucosal resection). We studied 646 colorectal polyps(198 treated using CSP and 448 using EMR). An unevaluable/positive(X/+)margin was seen in 57% of the CSP specimens and 40% of the EMR specimens ; suction damage and an X/+ VM(vertical margin)were significantly higher in the CSP specimens than in the EMR specimens. The resection layer was mostly found to be the muscularis mucosae(83%)in the CSP specimens. The risk factor associated with an X/+ VM was a serrated lesion. Endoscopists should decide CSP adaptation with the understanding of the histological features of CSP specimens.
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