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要旨 患者は78歳,女性.排便時に血便を認めるようになったことから近医を受診し,大腸内視鏡検査で直腸に病変を指摘されたため,当院へ紹介となった.当院での大腸内視鏡像では,下部直腸に径10mm大の発赤調を呈する0-Is+IIc型の上皮性腫瘍を疑った.また,その近傍に径4mm程の小隆起性病変(副病変)を認めた.術前診断では,内分泌細胞癌,未分化癌を疑い,超音波内視鏡検査,NBI併用拡大内視鏡検査の結果から,深達度はSM以深と診断した.他臓器転移は認めず,D2リンパ節郭清を伴う腹会陰式直腸切断術を施行した.病理組織学的所見では,2病変ともに腫瘍細胞はメラニン顆粒を含み,免疫染色ではHMB-45,S-100は陽性を示しており,悪性黒色腫の診断となった.主病変は深達度MPであったが,副病変は粘膜内病変であった.
A 78-year-old woman with melena was found to have an elevated rectal lesion during a colonoscopy, thereby the patient was referred to our department.
Repeat colonoscopy revealed a 10mm reddish lesion of type 0-Is+IIc with a satellite nodule 4mm in diameter. Endoscopic diagnosis showed a poorly differentiated carcinoma and a neuroendocrine carcinoma. The lesion invasion depth was limited to the submucosa as shown by preoperative imaging. Because no obvious metastatic lesions were noted, we performed abdominoperineal resection with D2 lymph node dissection. Microscopically, the tumor cells reacted positively to immunohistological staining with HMB-45 and S-100. Melanin was observed in only a few tumor cells. The final pathological diagnosis was malignant amelanotic melanoma depth MP, and the satellite lesion was m, n0.
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