MRCP2-1301

You assess a 54-year-old man who reports having undergone pituitary surgery (and ‘some treatment’ after the operation), some time ago. He presents with complaints of feeling lethargic, having reduced energy and vitality.

Upon examination, you note increased central abdominal adiposity and reduced grip strength. The patient is currently on thyroid and cortisol replacement therapy, and blood tests indicate that these are at adequate levels. FBC, U&E, and LFTs are all within normal limits.

What would be the most appropriate investigation to conduct next?