Hypercalcemia associated with granulomatous disease in a cat

A 6-year-old cat was examined because of recurrence of a draining mass invo lving skin and subcutaneous tissues of the caudoventral aspect of the abdom en. Previous treatment included administration of antimicrobial drugs and c orticosteroids and surgical excision. Atypical mycobacteria were seen durin g cytologic examination of biopsy specimens of the mass; Nocardia sp was cu ltured. While hospitalized, the cat developed hypercalcemia and was found t o have high serum calcitriol concentrations. Treatment consisted of adminis tration of ciprofloxacin and trimethoprim-sulfadiazine because of the infec tion and administration of sodium chloride solution, furosemide, and calcit onin because of the hypercalcemia. The cat recovered.