Fig. 7.

A 25-year-old man presented to the emergency department with a 1-week history of fever, voiding difficulty, and bilateral flank pain. Blood analysis revealed leukocytosis and elevated serum creatinine levels. a–c Axial contrast-enhanced CT images show a large retroperitoneal Gharbi type 3 hydatid cyst extending from the right kidney to the pelvic region (asterisks, a–c). The right kidney is no longer visible on CT due to the replacement of renal parenchyma with a hydatid cyst. Left-sided hydroureteronephrosis (arrows, a and b) was evident due to left ureteral compression by the pelvic portion of the hydatid cyst. Significantly compressed bladder (arrowhead, c) was also noted. Histopathological examination following surgery revealed the diagnosis of retroperitoneal hydatid disease and associated right kidney involvement