RESOLUTION OF A LEFT URETERAL STONE USING ELECTROHYDRAULIC LITHOTRIPSY IN A THOROUGHBRED COLT

A 3-year-old Thoroughbred colt was presented for evaluation of azotemi a and anorexia. Physical examination revealed a ureterolith in the lef t ureter, approximately 10 cm from the bladder, which was thought to o bstruct urine flow by approximately 90% when viewed cystoscopically. U ltrasonographic examination of both kidneys revealed indistinct cortic omedullary junctions. and the right kidney was more hyperechoic. A per cutaneous biopsy of the right kidney revealed chronic interstitial nep hritis with marked interstitial medullary fibrosis. Medical therapy co nsisting of IV fluids, sodium chloride PO, and ammonium chloride PO wa s initiated. Ureteroscopic electrohydraulic lithotripsy via a perineal urethrostomy was used to successfully remove the stone, Klebsiella ox ytoca, which responded to oral enrofloxacin therapy, was cultured from the urine after surgery. Azotemia resolved and the horse resumed trai ning.