[PREOPERATIVE INTERNAL DRAINAGE FOR PEDIATRIC GIANT HYDRONEPHROSIS CROSSING THE MIDLINE: REPORT OF TWO CASES].
Giant hydronephrosis extending beyond the midline can cause marked dilatation of the renal pelvis and significant anatomical distortion. This distortion makes intraoperative visualization, identification of the ureteropelvic junction (UPJ), and planning of the anastomosis challenging. To address this issue, preoperativ...