Waterhouse-Friderichsen syndrome Quiz: Ace Your Exams

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A 44-year-old female presents to an endocrinology PA for follow-up testing after having findings concerning for an endocrine disorder at her primary care physician's office. She initially presented with several months of fatigue, weight loss, and abdominal pain. Her laboratory findings from this visit are demonstrated below:  
 
 Laboratory Value  Result 
 Cortisol 8AM   3 mg/dL (Reference range: 5-25 mg/dL) 
 Random Adrenocorticotropic hormone (ACTH)   5 pg/ml (Reference range: 10-60 pg/ml) 
   
An ACTH stimulation test is ordered and pending. Which of the following is the most likely diagnosis? 

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