Primary ovarian hydatid cyst mimicking cyst adenoma: a rare case report

Background: Hydatid cysts (HC) are zoonotic diseases that are mainly caused by Echinococcus granulosus . Ovarian HC is a rare condition with different and unspecified presentations. Here we report a rare case of primary ovarian HC. Case Presentation: A 47 -year -old woman with chronic abdominal pain and left hemipelvic fullness was referred to the Obstetrics Clinic of the Kowsar Hospital of Qazvin. Abdominopelvic sonography revealed a cystic mass, which primarily suggested a cyst adenoma. The tumor marker levels were within normal limits. After surgical resection, histopathological examination showed a cystic mass with dimensions of 10x6x3 cm, smooth external and internal aspects, wall thickness of 0.3 cm, and multiple pieces of irregular gray membranous tissue. The patient was treated with albendazole 3 months after surgery, and a 6month follow-up sonogram revealed no signs of recurrence. Discussion: HC has non-specific presentations. Radiologists, pathologists, and surgeons should consider HC as a differential diagnosis for any cystic mass in the pelvic cavity, especially in endemic areas. Surgical resection and albendazole administration are the chosen treatments.