虫垂粘液嚢腫の3切除例を経験したので報告する.症例1は62歳女性.血便を主訴に近医から当科に紹介となった.精査の結果,虫垂粘液嚢胞腺癌が疑われ,右半結腸切除術(D2郭清)を施行した.病理診断で虫垂粘液嚢胞腺癌(stageII)と診断された.術後はUFTを2年間内服し,術後8年経った現在も無再発で健在である.症例2は64歳女性.右下腹部痛を主訴に近医を受診し,急性虫垂炎を疑われ当科に紹介となった.急性虫垂炎の診断で回盲部切除術を施行したが,病理診断は虫垂粘液嚢胞腺腫であった.術後8年経った現在も健在である.症例3は77歳女性.心窩部痛を主訴に当院内科を受診.腹部CT検査で右卵巣嚢腫疑いと診断され,当院産婦人科で腹腔鏡下手術を施行された.術中所見で虫垂腫瘍が疑われたため当科紹介となった.後日,腹腔鏡下虫垂切除術を施行した.病理診断は虫垂粘液嚢胞腺腫であった.術後経過は良好である. We have experienced 3 cases of surgical resection for mucocele of the appendix. Case 1. A 62-year-old woman was referred to our hospital for melena. As a result of inspection, mucinous cystadenocarcinoma of the vermiform appendix was suspected and right hemicolectomy with lymph node dissection was performed. The final pathological diagnosis was mucinous cystadenocarcinoma. After the operation, she had taken UFT for 2 years. She is still alive without recurrence for 8 years. Case 2. A 64-year-old woman visited a local clinic for right lower abdominal pain. She was referred and admitted to our hospital on suspicion of acute appendicitis. Under a preoperative diagnosis of acute appendicitis, ileocecal resection was performed. The pathological diagnosis was mucinous cystadenoma of the vermiform appendix. She has been alive for 8 years from the operation. Case 3. A 77-year-old woman visited our hospital for epigastralgia. On suspicion of right ovarian cyst, laparoscopic surgery was performed by gynecologists. During the operation, appendiceal tumor was suspected and she was referred to our department. Under the diagnosis of appendiceal mucocele, laparoscopic appendectomy was performed . The pathological diagnosis was low grade appendiceal mucinous neoplasm. She is still alive.