In a chronic smoker with mild haemoptysis. He also gave a history of hypeension and obesity. Lab data showed raised ACTH levels, which were not suppressed by dexamethasone. The cause for the Cushing's syndrome ha the patient is -: (A) MEN I, (B) Pituitary adenoma, (C) Adrenal coical adenoma, (D) Ectopic ACTH secreting tumor
Answer is D. ectopic ACTH production is not suppressed by high dose of dexamethasone (Harrison 17 pg 2256)