Desmopressin administration elicits a significant rise in ACTH and cortisol levels in the majority but not all patients with Cushing's disease. There is a good, but not complete, concordance between the response to the desmopressin test and the surgical outcome. Our preliminary data show that persistence of the ACTH response to desmopressin in the early postoperative period might be associated with a higher risk of late relapse.

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