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Pituitary dependent hypercortisolism, more commonly known as Cushing's disease, is caused by a pituitary tumor (non-cancerous) that triggers excessive levels of the stress hormone cortisol.
Cushing syndrome: refers to the symptoms and signs associated with excess cortisol. In addition to Cushing disease, Cushing syndrome may be due to an adrenal tumor, adrenal hyperplasia, the use of steroid medications, or due to an ACTH-producing tumor located outside the pituitary (ectopic), such as in the lungs.