Rare Coexisting Primary Hydatid Cyst and Mucinous Cyst Adenoma of Right Ovary.

The human hydatid cyst is caused by different species of the tapeworm of genus Echinococcus. In past literatures, the existence of hydatid cysts in various organs has been documented, but one pertaining to the ovary, especially with a coexisting mucinous cystadenoma is an enigma, with an incidence between 0.2 and 2.25%. In our case, a 70-year-old lady presented with a huge ovarian cyst, which was macroscopically and histopathologically proven to be the concomitant existence of a mucinous cyst of ovary and a cluster of mother and daughter hydatid cysts. In this case, no other organ showed evidence of hydatid cysts, notably the liver and lungs, the two commonest sites of involvement.