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要旨 患者は55歳,女性.便潜血検査陽性の精査目的で来院した.大腸内視鏡検査で上行結腸に半周性の丈の低い隆起性病変を認め,色調は周囲健常粘膜とほぼ同色調で,表面は結節集簇様を呈し,辺縁の一部に結節の粗大化を伴っており,結節混在型と診断した.境界および表面性状は色素撒布で明瞭となった.注腸造影検査では,表面が顆粒集簇様を示す長径約5cmのⅡa型の隆起性病変が上行結腸の腹側壁に描出され,病変部腸管壁の伸展性は良好であった.生検で高分化腺癌の組織像が得られた.病変の大きさと深達度を考慮して右半結腸切除術を施行した.切除標本では,大きさ5.0×3.3cm,高さ0.8cmのⅠ+Ⅱa型病変で,病理組織検査で深達度mの早期大腸癌と診断された.
A 55-year-old female visited to our center because of positive occult blood test. A nodule-aggregating lesion 5.0 cm in size, was detected in the ascending colon by colonoscopy and barium enema study. The lesion was diagnosed as early cancer, and surgical resection of the ascending colon was performed.
Histopathologically, the lesion proved to be a well differentiated adenocarcinoma, intramucosal carcinoma, type Ⅰ+Ⅱa, 5.0×3.3×0.8 cm in size.
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