Best of Five 109

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BOF: 109

A 60-year-old male is under investigation for weakness of his legs, pigmentation of the skin, hypertension and glycosuria.

Results of serum cortisol estimations are;

0900 1170 nmol/l

2400 1100 nmol/l

After 48 hours of dexamethasone 8 mgs daily:

0900 1030 nmol/l

In further investigation of this patient the test most likely to identify the cause of his condition is:

a)      MRI head

b)      CT scan head

c)    Perimetry to define visual fields

d)      Chest x- ray

e)      ACTH levels

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