Hydatid disease of skeletal muscle is a rare entity. Liver followed by lung are the most common sites of hydatid cyst. Incidence of unusual sites which include spleen, kidney, mesentry, ovary, brain, skeletal system is 7,8 %. Skeletal muscle has the lowest incidence of primary hydatid among the unusual sites. Here we report a young female with rare primary hydatid disease of left posterior thigh extending into popliteal fossa.
