SLIDE TRAY #6 X-RAY: Duplication of left kidney. IVP filming 5 minutes after injection. The left kidney has two collecting systems. The upper unit shows irregular mildly dilated renal pelvis and irregular calyx, the lower unit is bigger with a malrotated mildly dilated pelvis and one normal calyx, one dilated calyx. The ureters of both units join into one before entering the bladder.