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直腸神経鞘腫に対し腹腔補助下低位前方切除術を施行した1例を経験したので報告する.症例は67歳男性.腹痛と下痢にて近医を受診し,注腸検査で異常所見を認め当科に紹介された.注腸造影,大腸内視鏡,超音波内視鏡,CT所見から直腸カルチノイドまたはgastrointestinal stromal tumor(GIST)との診断のもと腹腔鏡補助下低位前方切除術およびD2リンパ節郭清を行った.腫瘍はHE染色で多形性な細胞が束状に錯綜配列し線維の増殖を伴っており,細胞分裂像は認めなかった.免疫染色でS−100蛋白陽性,vimentin陽性,CD 34,c-kit,α—SMA,desminは陰性であった.以上より直腸原発良性神経鞘腫と診断した.
We report a patient with rectal schwannoma who underwent laparoscopic low anterior resection. A 67-year-old male patient suffering from abdominal pain and diarrhea was referred to our department. Barium enema and computed tomography demonstrated a submucosal tumor of the rectum. Because our pre-operative diagnosis was carcinoid or gastrointestinal stromal tumor of the rectum, low anterior resection with D2 lymph node dis-section was carried out. The postoperative pathological and immunochemical examinations revealed benign rec-tal schwannoma. The rectal schwannoma is extremely rare.
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