The most common cause of Cushing&;s syndrome is-: (A) Pituitary adenoma, (B) Adrenal adenoma, (C) Ectopic ACTH, (D) Iatrogenic steroids
Answer is D. m/c cause of ACTH dependent cushings syndrome is PITUTATRY ADENOMA. M/C cause of ACTH independent cushings syndrome is IATROGENIC STEROIDS. OVER ALL M/C cause of cushings syndrome is IATROGENIC STEROIDS. Reference : page 2314 Harrison&;s Principles of Internal Medicine 19th edition