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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 65-year-old obese man presents to his primary care clinic feeling weak. He was in the military and stationed in Vietnam in his youth. His current weakness gradually worsened to the point that he had to call his son to help him stand to get on the ambulance. He smokes a pack of cigarettes every day and drinks a bottle of vodka a week. He has been admitted for alcohol withdrawal multiple times and has been occasionally taking thiamine, folic acid, and naltrexone. He denies taking steroids. His temperature is 98°F (36.7°C), blood pressure is 170/90 mmHg, pulse is 75/min, and respirations are 20/min. He is obese with a significant pannus. Hepatomegaly is not appreciable. Abdominal striae are present. His workup is notable for the following:

Serum:
Na+: 142 mEq/L
Cl-: 102 mEq/L
K+: 3.9 mEq/L
HCO3-: 25 mEq/L
BUN: 24 mg/dL
Glucose: 292 mg/dL
Creatinine: 1.5 mg/dL
Ca2+: 10.1 mg/dL
AST: 7 U/L
ALT: 14 U/L
24-hour urinary cortisol: 400 µg (reference range < 300 µg)
Serum cortisol: 45 pg/mL (reference range < 15 pg/mL)

A 48-hour high dose dexamethasone suppression trial shows that his serum cortisol levels partially decrease to 25 pg/mL and his adrenocorticotropin-releasing hormone (ACTH) level decreases from 10 to 6 pg/mL (reference range > 5 pg/mL). What is the best next step in management?
assistant
MRI of the pituitary gland