SAT-271 Block and Replace Therapy Successfully Improved Symptoms in Recurrent Cyclic Cushing’s Disease

BACKGROUND: Cyclic Cushing’s disease is rare and treatments have not been established for post-surgical recurrent cases. Here, we report a patient with recurrent cyclic Cushing’s disease, whose subjective symptoms improved by administration of metyrapone and hydrocortisone. Clinical Case: A 45‐year-old woman had exhibited face and peripheral edema, hyperphagia, weight gain, hair loss and limb numbness since September X-10. In May X-9, her ACTH and cortisol levels were high (87.8 pg/mL and 28.8 µg/dL, respectively), and she was referred to our department. A brain MRI revealed a pituitary adenoma of 7mm in diameter. Because blood ACTH and cortisol levels turned normal and typical Cushingoid features were absent at the admission to our department, cyclic Cushing’s disease was suspected. Later in September, because subjective symptoms recurred accompanied with blood cortisol level elevation, she was diagnosed as cyclic Cushing’s disease with the examinations including inferior petrosal sinus sampling. Transsphenoidal surgery was performed in November, and immunohistology confirmed ACTH-producing pituitary adenoma based on ACTH positivity. After the surgery, endocrine test results were normalized and subjective symptoms were ameliorated. In March X-3, the blood ACTH level increased again; however, no subjective symptoms were observed. From May X, she had experienced limb numbness, hyperphagia and weight gain again. MRI showed no apparent recurrence, but endocrine tests showed the activity of Cushing’s disease. Urinary free cortisol (UFC) increased to 300–400 µg/day in a 1-week cycle, indicating the recurrence of cyclic Cushing’s disease. Metyrapone treatment was initiated, and the patient was finally discharged after block and replace therapy with metyrapone 2,000 mg/day and hydrocortisone 15 mg/day. After metyrapone treatment, subjective symptoms improved and UFC was normalized. Conclusion: Block and replace therapy with metyrapone and hydrocortisone may be effective for recurrent cyclic Cushing’s disease, especially in cases with a very short cycle.