[Muscular echinococcal cysts. A rare differential diagnosis of a soft tissue swelling].

We report about a 48 year old female patient with a tumor of the soft-tissue of the right upper leg. The diagnostic results showed an echinococcus cyst of the muscle adductor longus. It is reported that in 0.5-5% of the cases echinococcus cysts could be located in muscles. But mostly this is not the primary location.