Final answer:
Cushing's syndrome is a condition characterized by high cortisol levels, low ACTH, and a failed dexamethasone suppression test. It is often caused by a pituitary tumor. The treatment for adrenal carcinoma, which presents with these symptoms, is surgical excision.
Step-by-step explanation:
An adrenal carcinoma presents with a failed dexamethasone suppression test, high cortisol, low ACTH. This condition is known as Cushing's syndrome. It is caused by the hypersecretion of the glucocorticoid hormone cortisol. The most common cause of Cushing's syndrome is a pituitary tumor, which leads to excessive production of ACTH. The treatment for adrenal carcinoma is surgical excision, which involves removing the tumor.