en Gynecology & Obstetrics Gynecology & Obstetrics case report case report <b><font face="TimesNewRomanPS-BoldMT"><p align="left">Abstract</p></font><font size="2" face="TimesNewRomanPSMT"><font size="2" face="TimesNewRomanPSMT"><p align="left">Hydatid disease is a widespread parasitic infection caused by tapeworm</p><p align="left">Echinococcus and it affects mainly the liver, but other organs such as pelvic organs</p><p align="left">could be involved very rare. Here we report a case of hydatid cyst with involvement</p><p align="left">of oviduct in a woman with endometrial cancer. It was misdiagnosed as a multicystic</p><p align="left">right ovarian mass before surgery and by microscopic study it was shown as a primary</p><p align="left">degenerated hydatid cyst which was also unusual. Although pelvic echinococcal</p><p align="left">cysts rarely occur, the gynecologists should be consider, and the possibility of a</p><p align="left">hydatid cyst when they find a pelvic cystic mass, especially in areas where the disease</p><p align="left">is endemic.</p></font></font></b> hydatid disease, echinococcus, oviduct, endometrial cancer. 212 214 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-20&slc_lang=en&sid=1 Afsaneh Tehranian afsanehtehranian@yahoo.com 20031947532846001694 20031947532846001694 Yes Tehran University of Medical Sciences, Roointan Arash Bita Eslami 20031947532846001695 20031947532846001695 No Roointan Arash Women’s Health Research and Educational Hospital, Tehran University