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11150 Medicine

A 60 year old male presented with skin hyperpigmentation, central obesity, violet striae & proximal myopathy. His BP is 160/90 mmHg. Lab studies show hypokalemic metabolic alkalosis. Which of the following statements is true regarding this condition?

ABasal ACTH level is likely to be low.
BCirculating coicotropin-releasing hormone is likely to be elevated.
CPituitary magnetic resonance imaging (MRI) will visualize all ACTH-secreting tumors.
DSerum potassium level <3.3 mmol/L is suggestive of ectopic ACTH production (Correct Answer)