What's the difference between hyperadrenocorticism and Cushing's syndrome?
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“Terms often are used interchangeably, but it is important to distinguish the difference between the definition of hyperadrenocorticism (HAC) and Cushing's syndrome. HAC is defined as an overproduction of steroid hormones from the adrenal cortex. Cushing's syndrome refers to HAC with excess production of cortisol. Finally, atypical Cushing's disease refers to HAC caused by increased levels of intermediate adrenal steroids.”
-Ronald Lyman, DVM, DACVIM
From Consider ACTH stimulation test when you suspect canine hyperadrenocorticism