内容紹介
A Case of Mucinous Cystadenocarcinoma of the Retroperitoneum Supposed to Be Derived from Ectopic Ovarian Tissue
Summary
Most tumors arising in the retroperitoneum are non-epithelial, and epithelial tumors are very rare. We report a case of mucinous cystadenocarcinoma of the retroperitoneum supposed to be derived from ectopic ovarian tissue. A 56-year-old woman was admitted to the hospital because of abdominal distention, and an abdominal CT scan revealed a cystic tumor of the right lower retroperitoneum. We had been observing the patient for 10 years for this lesion, but at this point, the tumor showed an increase in size and nodules had appeared inside of the cyst. It was presumed to be malignant, and so the decision was made to perform resection. Upon laparotomy, a large cystic tumor was found in the right iliac fossa displacing the ascending colon and the cecum medially. The cyst had no connection with any surrounding structures. The tumor was a simple large cyst, measuring 9×7 cm, with a protruding papillary tumor inside. The inner space of the cyst was filled with mucinous fluid. Histologically, the tumor was diagnosed as a mucinous cystadenocarcinoma. The patient has currently been undergoing follow-up for 7 months with no evidence of recurrence.
要旨
多くの後腹膜腫瘍は非上皮性で,上皮性悪性腫瘍はまれである。今回われわれは,後腹膜粘液性嚢胞腺癌の1例を経験したので報告する。症例は56歳,女性。腹部膨満を主訴に来院した。10年前に右下腹部に後腹膜嚢胞を指摘され,経過観察されていた。その後CT検査で嚢胞の増大傾向ならびに内部に結節成分を認めたため,後腹膜嚢胞腺癌の診断で手術の方針となった。腫瘍は右側腹部後腹膜腔に存在し,腸腰筋,腎下極および上行結腸に接していたが,腸管との連続性はなかった。腫瘍は9 cm大の表面平滑な単房性嚢胞性病変で,内腔は粘稠な内容液で占められ,一部隆起部分を有していた。病理組織学検査で嚢胞内腔の隆起部分に腺癌細胞の乳頭状増殖がみられ,ER染色およびPgR染色が陽性であったため,異所性卵巣由来の後腹膜粘液性嚢胞腺癌と診断した。術後7か月の現在,再発兆候なく生存中である。
目次
Summary
Most tumors arising in the retroperitoneum are non-epithelial, and epithelial tumors are very rare. We report a case of mucinous cystadenocarcinoma of the retroperitoneum supposed to be derived from ectopic ovarian tissue. A 56-year-old woman was admitted to the hospital because of abdominal distention, and an abdominal CT scan revealed a cystic tumor of the right lower retroperitoneum. We had been observing the patient for 10 years for this lesion, but at this point, the tumor showed an increase in size and nodules had appeared inside of the cyst. It was presumed to be malignant, and so the decision was made to perform resection. Upon laparotomy, a large cystic tumor was found in the right iliac fossa displacing the ascending colon and the cecum medially. The cyst had no connection with any surrounding structures. The tumor was a simple large cyst, measuring 9×7 cm, with a protruding papillary tumor inside. The inner space of the cyst was filled with mucinous fluid. Histologically, the tumor was diagnosed as a mucinous cystadenocarcinoma. The patient has currently been undergoing follow-up for 7 months with no evidence of recurrence.
要旨
多くの後腹膜腫瘍は非上皮性で,上皮性悪性腫瘍はまれである。今回われわれは,後腹膜粘液性嚢胞腺癌の1例を経験したので報告する。症例は56歳,女性。腹部膨満を主訴に来院した。10年前に右下腹部に後腹膜嚢胞を指摘され,経過観察されていた。その後CT検査で嚢胞の増大傾向ならびに内部に結節成分を認めたため,後腹膜嚢胞腺癌の診断で手術の方針となった。腫瘍は右側腹部後腹膜腔に存在し,腸腰筋,腎下極および上行結腸に接していたが,腸管との連続性はなかった。腫瘍は9 cm大の表面平滑な単房性嚢胞性病変で,内腔は粘稠な内容液で占められ,一部隆起部分を有していた。病理組織学検査で嚢胞内腔の隆起部分に腺癌細胞の乳頭状増殖がみられ,ER染色およびPgR染色が陽性であったため,異所性卵巣由来の後腹膜粘液性嚢胞腺癌と診断した。術後7か月の現在,再発兆候なく生存中である。