Cushing’s syndrome is a condition which is due to prolonged exposure of the body tissue to excess cortisol (glucocorticoid hormone).
Laboratory tests and radiological findings confirm diagnosis and determine the actual cause of Cushing's syndrome.
Endogenous adrenocorticotropic hormone (ACTH)-independent Cushing's syndrome has adrenal hypersecretion due to adrenal adenoma, adrenal carcinoma, micronodular hyperplasia, and macronodular hyperplasia.
Exogenous ACTH-independent Cushing's syndrome has adrenal hypersecretion due to iatrogenic causes (eg drug-induced, corticosteroid use).

Cushing's Syndrome References

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