<prompt> Answer this question truthfullyWhat is the diagnosis for a patient suspected to have Cushings diseasesyndrome, whose 24-hour urine cortisol test confirms hypercortisolism and follow-up ACTH testing is low?  <response>: <reason> The diagnosis for this patient is Cushings syndrome secondary to an adrenal tumor. A low ACTH level suggests that the excess cortisol production is not due to a pituitary adenoma Cushings disease but rather an adrenal tumor. Further imaging with a CT or MRI scan can confirm the presence of an adrenal tumor. Treatment options for Cushings syndrome may include surgical removal of the tumor, medication to block cortisol production, or radiation therapy. 