Hydatic cyst is a prevalent parasitic disease in Mediterranean region, Middle East and Australia. Its diagnosis is sometimes problematic because of nonspecific complaints and unavailability of any positive result in a routine laboratory analysis. In this study, an primary right renal hydatic cyst which was found in a young female has been presented. The multilocular cyst was completely removed by total nephrectomia surgery. A late diagnosis due to unclear clinic manifestations was considered to be the main reason for the loss of the organ. It will be beneficial to consider a renal hydatic cyst when the patients with blurred flank pain are encountered.