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Hydatidosis is a parasitic infection mostly in found in the liver and lung due to echinococus species. But occurrence in other locations is possible. Purpose of this report is to describe a case of bilateral Hydatid cyst in ovaries. Clinical findings with this uncommon location are poorly specific and diagnosis required histologic examination after surgical removal. Imaging and serology is useful to differentiate Hydatid cyst from benign and malignant tumors. This obligatory to examine lung and liver as the main sites of cyst when you are being faced with unusual location of Hydatid cyst especially in endemic area such as Iran. Our patients was a 35 years old woman with history of 4-month abdominal pain in left and right lower quadran. Sonography showed two cysts in adenexal lesions after surgical removal, they were sent to pathology lab. Hydatic cyst membrane was seen in histologic examination of two cystic masses.

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Background and Objective: Hydatidosis is a chronic, zoonotic worldwide infection which induced by larval stage of Echinococcus worm. This study was done to assessment the pure and B hydatid cyst fluid antigens for the serological diagnosis of human hydatidosis. Methods: In this descriptive laboratory study, infected liver with Hydatid cyst were obtained from Tehran's slaughterhouses to prepare cyst fluid in different stages. After draining and purifying the cyst fluid, it was centrifuged and subsequently concentrated. Specificity and sensitivity of sera samples including hydatidosis (n=60), worm parasites (n=55), fascioliasis (n=35), toxocariasissera (n=20) and negative control (n=35) were tested by Counter Immunoelectrophoresis (CIEP), ELISA and Dot ELISA methods. Results: Specificity and sensitivity of pure antigen of hydatid cyst using CIEP method was 68.9% and 86.7%, respectively. Specificity and sensitivity of B-antigen using CIEP method was 87.8% and 83.3%, respectively. Specificity and sensitivity of pure antigen of hydatid cyst using ELISA method was 76.7%, and 93.3%, respectively. Specificity and sensitivity of B-antigen using ELISA method was 96.7% and 88.3%, respectively. Specificity and sensitivity of pure antigen of hydatid cyst using Dot ELISA method was 83.3% and 100%, respectively. Specificity and sensitivity of B-antigen using Dot ELISA method was 100% and 98.3%, respectively. Conclusion: B-antigen using Dot ELISA method is the most suitable serological test for the diagnoses of hydatid test.