Chronic renal failure associated with nephrolithiasis, ureterolithiasis, and renal dysplasia in a 2-year-old quarter horse gelding

A 2-year-old quarter horse gelding presented for evaluation of polyuria and polydipsia, Azotemia was detected on serum chemistry profile. Small, missh apen, hyperechoic kidneys with decreased corticomedullary demarcation, hydr onephrosis, and a right nephrolith were noted ultrasonographically. The dia gnosis of end-stage kidney disease and dysplasia was made histopathological ly using ultrasound-guided biopsy. Two ureteroliths were found in the right ureter via cystoscopy, and a nephrolith was seen in the right kidney at ne cropsy. Clinical, ultrasonographic, and pathologic features of equine uroli thiasis and renal dysplasia are discussed.