Serous Cystadenoma of the Greater Omentum with Symptomatic Improvement after Resection: A Case Report

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  • 切除により症状の改善を得た大網漿液性囊胞腺腫の1例

Abstract

<p>A 40-year-old woman presented to our hospital with a complaint of worsening lower abdominal pain that had persisted for 2 months. Blood and urine tests showed no abnormal findings, and a pregnancy test was negative. CT and MRI showed a 7-cm unilocular cyst, presumably of omental origin, but no other abnormal findings that could have caused the symptoms. For this reason, laparoscopic excision of the cyst was performed. Intraoperative laparoscopy revealed that the cyst was contiguous with the margins of the greater omentum, but not with any pelvic organs. Histopathology showed a 7-cm unilocular cyst with a wall covered with a monolayer ciliated epithelium. Immunostaining was positive for PAX8 and the cyst was thought to be homologous to a serous cystadenoma of the ovary. Postoperatively, the symptoms resolved. Serous cystadenomas commonly arise in the ovary. In sites other than the retroperitoneal space, there have been several reports of such cysts arising in the posterior mediastinum, but no reports of similar cysts in the greater omentum. The cyst in this case was presumed to be an ectopic epithelium of the fallopian tube or fimbriae migrating into the greater omentum. Symptoms such as those in this case are considered to be an indication for surgery.</p>

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