腹腔鏡下腫瘍生検術によりmesothelial inclusion cystと診断し得た症例

抄録

　Mesothelial inclusion cysts（MICs）are benign lesions that arise from mesothelial cells and are particularly rare. They have been reported to be associated with a history of prior surgery or pelvic inflammation, especially in young females． We report a case of a 24-year-old, para 0 woman who had undergone abdominal left adnexectomy for a stage IC1(pT1c1N0M0) ovarian borderline malignant tumor five years prior, then presented with multiple cystic lesions in the abdomen during follow-up. A contrasted computed tomography scan was performed, and the results revealed a large number of cystic lesions in the abdominal cavity and retroperitoneal space.

　Given the possibility of peritoneal dissemination, laparoscopic tumor biopsy was performed. A small amount of yellowish ascites and a large number of cystic lesions up to 0.5 to 2 cm in size were scattered throughout the uterus, intestines, peritoneum, and diaphragm. Contrary to expectations, histology exhibited a diagnosis of a benign MIC.

　Surgical resection is the basic treatment for MICs．Even with cases of benign lesions, the recurrence rate after surgery is about 50%. It has been reported that anti-estrogen drugs and sclerotherapy may contribute to the treatment for recurrent tumors, but due to the lack of reports, standard treatment and management methods have yet to be established. Therefore, long-term follow-up is essential.