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We report a rare case of a 57-year-old female patient with Cushing's disease who had clinically and biochemically proven cyclicity. There were periodic increases in plasma ACTH and cortisol and urinary free cortisol and 17-OHCS. Plasma CRH was undetectable and plasma ACTH responded to exogenous CRH when basal plasma cortisol was relatively low. Neither plasma ACTH nor cortisol responded to dexamethasone (oral and intravenous) but plasma ACTH was clearly suppressed by cortisol infusion. With 40 mg/day bromocriptine, the periodic hypercortisolemia disappeared and the patient was maintained on remission. The response of plasma cortisol to dexamethasone suppression test was also normalized.

Cortisol-Suppressible Dexamethasone-Nonsuppressible Cyclic Cushing's Disease with Evidence of Clinical and Biochemical Remission with Bromocriptine.