Medicine Endocrinology 1e28866e About cushing syndrome, true Is - A Low dose dexamethasone suppress coisone secretion B CA of adrenal is more common than adenoma C Pituitary adenoma size > 2 cm (usually) D ACTH secretion is the commonest cause High-Yield Explanation most cases the cause is bilateral adrenal hyperplasia due to hyper secretion of pituitary ACTH or ectopic production of ACTH by a non pituitary source ( Harrison 17 pg 2255)