The most common cause of Cushing's syndrome is:: (A) Pituitary adenoma, (B) Adrenal adenoma, (C) Ectopic ACTH, (D) Iatrogenic steroids
Answer is D. d. Iatrogenic steroids(Ref: Nelson's 20/e p 2227-2729, Ghai 8/e p 525)The most common cause of Cushing's syndrome is prolonged exogenous administration of glucocorticoid hormones, especially at the high doses used to treat lymphoproliferative disorders.