Testing to establish the cause of Cushing syndrome^*

ACTH: corticotropin; CRH: corticotropin-releasing hormone; CT: computed tomography; dex: dexamethasone; IPSS: inferior petrosal sinus sampling; MR: magnetic resonance; MRI: magnetic resonance imaging.

* Testing can only be interpreted in the context of sustained hypercortisolism and may be inaccurate with cyclic hypercortisolism.

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