Abstract
症例は41歳，女性．肛門腫瘤で当院を受診した．直腸診では，肛門皮膚部5時方向に硬い腫瘤を触知し，肛門エコーでは，肛門5時方向に，肛門管と連続しない低エコー病変を認め，エラストグラフィーでは，周辺とは明らかに性状の異なる，硬い腫瘤として描出された．悪性の可能性が否定できず腫瘍切除の適応とした．手術は腰椎麻酔下に肛門腫瘍切除を行い，病理では，細胞質の豊かな大型の細胞が密集する病変で，免疫組織学的染色では，S-100が陽性，顆粒細胞腫と診断された．
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