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A patient has thinning hair, round facies, hirsutism, buffalo hump, skin hyperpigmentation and striae, and a visual field defect. Laboratories show Na 140 mEq/L, K 2.8 mEq/L, Cl 110 mEq/L, CO2 28 mEq/L, BUN 16 mg/dL, Cr 1.2 mg/dL, glucose 200 mg/dL, and 24-hour urinary free cortisol of 100 micrograms (normal: <100 micrograms). A dexamethasone suppression test shows normal adrenocorticotropic hormone and normal 24-hour urinary free cortisol. Which of the following is appropriate for this patient?

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