A 52-year-old man with central obesity presents with new-onset diabetes, hypertension (BP 158/96 mmHg), and purple abdominal striae. He takes metformin but remains hyperglycemic. Vital signs show HR 88/min, RR 16/min, temperature 37.2°C. Laboratory studies reveal elevated 24-hour urinary free cortisol (285 mcg/24h; normal <50), suppressed ACTH (2 pg/mL), and fasting glucose 186 mg/dL. Abdominal CT demonstrates a unilateral 2.5-cm adrenal mass. Hirsutism is absent. Which diagnosis best explains his clinical presentation?

1. A)Adrenal cortisol producing adenomaGABARITO
2. B)Addison disease
3. C)Small cell lung carcinoma
4. D)ACTH secreting pituitary microadenoma
5. E)Ectopic CRH producing tumor