Adrenal insufficiency Quiz: Ace Your Exams

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A 56-year-old female presents to her endocrinology PA for follow-up testing after an MRI demonstrated a pituitary lesion. The patient initially presented with several months of fatigue, weight loss, and chronic headaches. During this visit, the patient has labs drawn, and the results are demonstrated below:  
 
 Laboratory Value  Result 
 Cortisol 8AM   12 mg/dL (Reference range: 5-25 mg/dL) 
 Random Adrenocorticotropic hormone (ACTH)   2 pg/ml (Reference range: 10-60 pg/ml) 
   
The patient is administered a metyrapone stimulation test. Which of the following accurately describes the mechanism of metyrapone? 

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