Renal hydatid cyst presenting as perinephric and iliopsoas abscess.

Hydatid disease is an infestation caused in humans by the larval forms of Taenia echinococcus. Isolated renal hydatid cyst is rare with a frequency of 2-4% of hydatid disease. Infection of hydatid cyst is a very rare condition. We describe a rare case of isolated renal hydatid cyst presenting as perinephric and iliopsoas abscess and discuss the dilemma in diagnosis and its management.