• Ilija Alvir, Boris Bevanda, Damir Danolić, Ivica Mamić, Lucija Kostić, Angelina Starčević-Božović, and Mario Puljiz.
• 1Department of Gynecologic Oncology, Sestre milosrdnice University Hospital Centre, University Hospital for Tumors, Zagreb, Croatia; 2Department of Clinical Pathology, Sestre milosrdnice University Hospital Centre, University Hospital for Tumors, Zagreb, Croatia.
• Acta Clin Croat. 2021 Jun 1; 60 (2): 323-325.

AbstractBenign multicystic peritoneal mesothelioma is a rare pathology that arises from the abdominal peritoneum. It has an affinity to develop on the surfaces of pelvic viscera. It predominantly occurs in women of reproductive age. The most used form of treatment is complete surgical removal. We report a case of a a 21-year-old female patient who presented with unclear diffuse abdominal pain. Transvaginal ultrasound and magnetic resonance imaging of the abdomen and pelvis revealed multiple functional cysts in the projection of the right and left ovary and free fluid in the pouch of Douglas. Laparoscopy was performed and multicystic tumor with thin, smooth walls, filled with clear serous content was found in lesser pelvis spreading to the left paracolic region and under the spleen. The multicystic mass was removed. Histologic examination revealed cystic formations filled with mucous content and formed from connective tissue outside and single row epithelium-mesothelium inside. Definitive diagnosis was benign multicystic mesothelioma of the abdominal peritoneum. The patient was well at one year follow-up.

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