[Unusual localization of an echinococcal cyst]. / Neobicna lokalizacija ehinokokne ciste.

Hardly ever one can find a hydatid cyst in other parts of the organism except in the liver and lungs. The localization in the retroperitoneum is very rare. We have shown an unusually located hydatid cyst in the retroperitoneum. The cyst was firmly integrated with the structure of m. psoas and the muscle resection was necessary.