Trilostane treatment of bilateral adrenal enlargement and excessive sex steroid hormone production in a cat.

A 14-year-old neutered female cat was presented for the investigation of aggression and male-type behaviour. Bilateral adrenal enlargement together with elevated plasma concentrations of oestradiol and testosterone were identified, with no evidence of hypercortisolaemia. These findings are similar to the syndrome of hyperadrenocorticism recognised most commonly in ferrets. The cat was treated for six months with the enzyme inhibitor drug, trilostane, and showed a moderate improvement in clinical signs.