The best treatment for Cushing's syndrome that is due to an ectopic ACTH secreting tumor is surgical removal of the tumor. In benign tumors, such as thymomas, or pheochromocytomas, this is usually possible.
However, many tumors are malignant (growing worse and resisting treatment), and have metastasized (spread to other areas) before cortisol excess has been diagnosed, and resection is not possible. Drugs to suppress cortisol secretion may be given in such situations. The drugs include: ketoconazole, aminoglutethimide, or metyrapone.
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