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• W2904709546 abstract "Cyclic Cushing syndrome is a rare variant of Cushing syndrome that demonstrates periodic cortisol excess. It has been thought that inhibition of a glucocorticoid positive-feedback loop is associated with remission of hypercortisolism in ACTH-dependent cyclic Cushing syndrome. However, the underlying mechanism that triggers the development of the hypercortisolism is still unknown. We observed a case of ACTH-dependent cyclic Cushing syndrome that was developed by exogenous glucocorticoids, possibly through a glucocorticoid positive-feedback loop.A 75-year-old woman had experienced cyclic ACTH and cortisol elevations six times in the previous 4 years. Her diagnosis was cyclic Cushing syndrome. During the hypercortisolemic phase, neither low-dose nor high-dose dexamethasone suppressed her plasma ACTH and cortisol levels. Daily metyrapone therapy decreased her plasma cortisol and ACTH levels during every hypercortisolemic phase. After the sixth remission of a hypercortisolemic phase, she took 25 mg of hydrocortisone for 4 weeks and developed ACTH-dependent hypercortisolemia. Treatment with 1 mg of dexamethasone gradually increased both plasma ACTH and cortisol levels over 2 weeks, resulting in the eighth hypercortisolemic phase. Treatment using a combination of dexamethasone and metyrapone did not increase plasma ACTH or cortisol level and successfully prevented development of ACTH-dependent hypercortisolism.We present an interesting case of cyclic Cushing syndrome in which ACTH-dependent hypercortisolemic phases relapsed during exogenous glucocorticoid treatment. A glucocorticoid positive-feedback loop and endogenous glucocorticoid synthesis may play key roles in the periodicity of hypercortisolism in cyclic Cushing syndrome." @default.
• W2904709546 created "2018-12-22" @default.
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• W2904709546 date "2018-12-17" @default.
• W2904709546 modified "2023-10-05" @default.
• W2904709546 title "ACTH-Dependent Cyclic Cushing Syndrome Triggered by Glucocorticoid Excess Through a Positive-Feedback Mechanism" @default.
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• W2904709546 doi "https://doi.org/10.1210/jc.2018-02268" @default.
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