In a chronic smoker which hemoptysis, he also gave a history of hypeension and obesity. Lab data showed raised ACTH levels, which are not suppressed by dexamethasone. The cause of Cushing's syndrome in the patient is -: (A) MEN1, (B) Pituitary adenoma, (C) Adrenal coical adenoma, (D) Ectopic ACTH secreting tumor
Answer is D. - History of chronic smoking and hemoptysis along with raised ACTH levels not suppressible by dexamethasone points to ectopic ACTH producing small cell carcinoma of lung.