The CT scan showed a tiny 2.5 mm calculus in the right kidney's midpole calyx, causing mild hydronephrosis. There was also mild thickening of the right renal pelvis wall. The left kidney and ureter were normal, though the left ureter was incompletely duplicated proximal to the VUJ. The impression was of normal contrast excretion from both kidneys, tiny right nephrolithiasis with mild hydronephrosis, and mild thickening of the right renal pelvis wall likely due to pyelitis or UTI.