Introduction/Background Benign multicystic mesothelioma is a rare form of neoplasm that originates from the peritoneum with a tendency to develop predominantly in the pelvic peritoneum. The lesions develop closely or in the uterus, ovaries, rectum, bladder and omentum.

Etiopathology is still unstudied but different thesis are proposed such as chronic inflammation or endometriosis.

Methodology The methodology used is qualitative with interviews, document exploration and surgical aproach.

Results A 52 -year-old perimenopausal female reported with the following symtoms ; abdominal distension, pelvic pain and mild sign of constipation. The patient was further examined with a ultrasound that revealed a multicystic pelvic mass suspected to be a ovarian mass.

A laparotomy was performed. Smooth, thin walled cysts were spread across the omentum, uterine wall, vesical fold and bilaterally in the ovaries. The cyst were filled with transparent mucinous fluid. The ovarian cysts were multichambered. A total abdominal hysterectomy, bilateral salpingoophorectomy, and partial omentectomy was performed . Final pathologic evaluation revealed a benign cystic mesothelioma, endosalpingitis and adenomyosis.

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Abstract #750 Figure 1

Conclusion Mostly these tumors present as multicystic masses with thin-walled septations and widely can mimic pelvic diseases mostly ovarian masses. Often diagnosis can only be made intraoperatively. In contrast to malignant mesothelioma that typically forms calcified nodules, the cystic mesothelioma forms liquid-filled cysts. Surgery is the only effective treatment for cystic mesothelioma. About half of the patient will experience a recurrence so follow up is neccesary.

Disclosures Adenomyosis and endosaloingitis are common factors associated with mesothelioma