Cortisol-secreting adrenal tumors are responsible for 10% to 15% of all cases of naturally occurring canine hyperadrenocorticism. Differentiation of adrenal-dependent hyperadrenocorticism from pituitary-dependent hyperadrenocorticism is very important because the recommended therapeutic approaches for each are different, and the prognosis also may be different. A stepwise approach to diagnosing and staging the disease is needed. Treatment options include surgery and administration of mitotane or ketoconazole.
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