Atrophic right kidney with increased parenchymal echogenicity and moderate hydronephrosis. Normal looking left kidney with mild compensatory hypertrophy. 

No radiotracer activity is noted in the region of right kidney (non-functioning right kidney). Left kidney shows homogeneous radiotracer uptake.

Findings: Relatively small right kidney with decreased cortical thickness, moderate hydronephrosis & mild perinephric fat stranding. Relatively small right renal artery. Dilated tortuous right ureter up to the right sacroiliac joint where there is a zone of transition and distal to this the ureter is of normal calibre. A focal abnormality measuring approximately 5.5 cm in craniocaudal length, having an average density of 30, 84, 86 & 81 HUs on plain, arterial, venous & renal excretory phases respectively, is seen in the right ureter (L3--L5 level). Left kidney, ureter and urinary bladder are grossly normal. Mildly bulky lateral limb of left adrenal gland. Impression: Right ureteric enhancing lesion suspicious of transitional cell carcinoma (TCC) with proximal hydroureteronephrosis and relatively small right kidney. 

Cystoureteroscopy with retrograde pyelography

Moderate right hydronephrosis and hydroureter with a zone of transition at the level of sacroiliac joint. A filling defect (likely a mass lesion) is seen in the right ureter (L3-L5 level). Normal looking left renal pelvicalyceal system & ureter.