Q. A 45-year-old woman presents to the clinic with hypertension and hyperglycemia. She has a history of hypothyroidism; her medications include levothyroxine and metformin. On physical examination, her blood pressure is 160/100 mmHg, and she has central obesity. Laboratory tests reveal elevated fasting glucose, serum cortisol, and aldosterone levels. Her 24-hour urinary-free cortisol level is normal. A computed tomography scan of the abdomen shows a 2-cm nodule in the right adrenal gland. Which of the following is the most appropriate management for this patient's adrenal adenoma?