腹腔鏡下に切除した上行結腸脂肪肉腫の1例

Liposarcoma of the ascending colon resected by laparoscopic surgery : A case report

◆要旨：患者は71歳，男性，定期的に行われていたスクリーニングのCT検査で上行結腸壁に腫瘍を認めた．内視鏡では粘膜下腫瘍様の所見であったが，超音波内視鏡では結腸壁外の病変と考えられた．PET検査で腫瘍に集積を認めたため，腹腔鏡下に手術を行った．手術所見で，腫瘍は後腹膜ではなく結腸内のものと考えられ，回盲部切除を行った．組織学的に腫瘍は脱分化型脂肪肉腫と診断された．結腸原発の脂肪肉腫は非常に稀であり，これを腹腔鏡下に摘出した報告は未だされていないため，報告する．

　A 71-year-old man was referred to our hospital with a submucosal tumor of the ascending colon that was revealed by screening computed tomography. Ultrasonic endoscopy diagnosed the lesion as a retroperitoneal tumor. Since the accumulation of fluorodeoxyglucose （FDG） in the tumor was detected by FDG-positron emission tomography （PET）, surgery was performed laparoscopically. The tumor was found in the ascending colon, and ileocecal resection was performed. A histological analysis revealed the tumor to be dedifferentiated liposarcoma of the colon. Primary liposarcoma of the colon is very rare, and a case resected by laparoscopic surgery has not been previously reported.