Hydatid cyst of the renal pelvis.

Hydatid disease is fairly common and is prevalent worldwide. The principal organs involved are the liver and lungs. Kidney involvement also occurs but usually with involvement of other viscera. Isolated hydatid cyst of the kidney is extremely uncommon. In the kidney, the hydatid cyst usually occurs in the renal parenchyma. We present a rare occurrence of a hydatid cyst of the renal pelvis in a 4-year-old child and discuss measures to decrease surgical morbidity.