Small/atrophic left kidney. A nonobstructive calculus measuring 5 mm is seen in the left distal ureter. Right kidney is normal in site, size, shape and parenchymal density. No radiopaque calculi are seen in the right kidney, right ureter and urinary bladder. Right kidney shows homogeneous parenchymal enhancement on the postcontrast study. Normal contrast excretion is noted from the right kidney on the delayed urographic images. Negligible contrast excretion is seen from the left kidney. Non-enhancing and non-opacifying tubular fluid density structures within the right renal pelvis, suggestive of renal sinus cyst (peripelvic cysts). Mild right hydronephrosis is also noted. Mildly prominent right middle ureter, likely due to peristalsis. Normal caliber long retrocecal appendix with its tip lying in a subhepatic location. Small fat-containing umbilical hernia and small hiatal hernia.