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要旨 患者は41歳,男性.近医で行った検診エコーにて肝の多発性腫瘤を指摘され,当科の外来に紹介され受診となった.腹部造影CTにて直腸に腫瘍性病変も認めたため,下部消化管内視鏡検査を施行したところ,上部直腸に発赤調の30mm大の隆起性病変を認めた.同部からの生検にて,好酸性の僅少の胞体を有する均一小型腫瘍細胞のリボン状増殖が認められ,免疫染色にてchromogranin陽性,synaptophysin陽性,CD56陽性,Ki-67指数2%未満で核分裂像をほとんど認めなかった.NET(neuroendocrine tumor)G1(carcinoid tumor)と診断し,低位前方切除術と肝移植術を施行し,術後病理ではNET G2であった.本症例は神経内分泌腫瘍の診断・加療において示唆に富む症例と考え報告する.
An asymptomatic 41 year-old man underwent abdominal ultrasonography for health check-up, and multiple liver tumor was demonstrated. Colonoscopy revealed a submucosal tumor-like lesion in the rectum. As the histopathological examination for biopsies, trabecular arrangement of cells was observed in the submucosa. Immunohistochemically, Chromogranin and Synaptophysin and CD56 were positive. The mitotic rate was low(<2 per 10 high power fields), and Ki-67 labeling index was low(<2%), and a provisional diagnosis of neuroendocrine tumor G1(carcinoid)was made. Lower anterior resection and partial liver transplantation were performed. Post-operative histopathological diagnosis was neuroendocrine tumor G2. Thereafter, multiple systemic metastases were found, and he had been treated by octreotide.
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