Urinary obstruction secondary to a retroperitoneal carcinoma in a dog

A 7-year-old, intact, anestrous, female Doberman pinscher was presented with anorexia and hindlimb swelling of three days duration. Renal failure was documented. Survey radiographs revealed patchy alveolar consolidation and bilateral renomegaly with increased retroperitoneal and sublumbar soft tissue opacification. Renal ultrasonography showed bilateral hydronephrosis with ectatic ureters. A retroperitoneal carcinoma was identified via fine needle aspiration. Percutaneous nephropyelocentesis and antegrade nephrography further delineated the hydronephrosis and ureteral obstruction