A common cause of Cushing syndrome is -: (A) Cancer producing ectopic ACTH, (B) Pituitary adenoma, (C) Adrenal tuberculosis, (D) None of the above
Answer is B. 75% cases of Cushing's syndrome is caused by ACTH-producing pituitary adenomas (Cushing's disease); Ectopic ACTH syndrome - 15%; adrenocoical adenomas-5 to 10% and adrenocoical carcinoma-1% and other rare causes-<1%. Reference : page 2314 Harrison's Principles of Internal Medicine 19th edition