Perineal and right femoral hydatid cyst in a female with regional paresthesia: a rare case report.

Background: Hydatid cyst is a zoonotic disease caused by the parasite Echinococcus granulosus. The tapeworm larvae can create cyst in different areas of the body, especially the liver and lungs; however, the formation of the cyst in the perineal and femoral regions are very rare. The unusual location of the cyst can help us with the differential diagnosis of soft tissue mass(es) in this location, especially in endemic areas.