Bilateral perirenal abscesses in a domestic neutered shorthair cat

A14-month-old male neutered domestic shorthair cat was referred for evaluation of azotemia, bilateral renomegaly, and a 1-week history of polyuria, polydipsia, and disorexia. On physical examination, the cat was lethargic, pyrexic (40.78C), tachycardic, and dyspnoic. On abdominal palpation, 2 painful, large, smooth masses were identified in the cranial abdomen. The kidneys were not identified. A CBC, serum biochemistry, and urinalysis were performed. Interpretation of clinicopathologic data revealed leukocytosis and a marked neutrophilia with evidence of toxic changes and azotemia (BUN 73 mg/dL; reference range, 10–32 mg/dL). The urine was dilute1,2 (urine specific gravity, 1.020) and proteinuria (urine protein : creatinine ratio, was present. Several renal epithelial cells, neutrophils, and bacteria (cocci) were observed in the urine sediment. To identify the abdominal masses, lateral and ventrodorsal abdominal radiographs were taken. Bilateral renomegaly was identified on evaluation of the abdominal radiographs. The right kidney was larger and more irregular in shape than the left kidney, and ventral displacement of abdominal viscera was observed on the lateral view.