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Establishing the cause of Cushing's syndrome (CS) can be a considerable challenge, in particular in ectopic adrenocorticotropic hormone (ACTH) syndrome, and often requires a combination of biochemical tests and imaging procedures.

european journal of endocrinology

Dual bronchial carcinoids and Cushing's syndrome with a paradoxical response to dexamethasone and a false positive outcome of inferior petrosal sinus sampling