A Rare Case of Renal Pelvic Hydatid Cyst Masquerading as Renal Calculi.

Hydatid disease of urinary tract is most common in the kidney. In kidney, hydatid cysts are most commonly found in the renal parenchyma. Isolated hydatid cysts in the renal pelvis are extremely rare with only three cases reported in the literature. We present a case of isolated hydatid cysts in the renal pelvis masquerading as renal pelvic calculi, which were diagnosed during surgery and confirmed on histopathology. Hydatid cysts can masquerade as renal calculi. Preoperative modalities may miss the correct diagnosis. Histopathology in suspected cases can confirm the diagnosis so that proper chemotherapy can be offered to patient to avoid recurrence.