Most common cause of ectopic ACTH production-: (A) Renal cell carcinoma, (B) Hepatocellular carcinoma, (C) Small cell carcinoma lung, (D) Pheochromacytoma
Answer is C. Ans. is 'c' i.e.. Small cell carcinoma lungo Ectopic ACTHproduction accounts for 10-20% cases of cushings syndromeo Small cell lung carcinoma (SCLC) is by far the most common causes of ectopic ACTH.# If accounts for more than 50%cases of cushings syndrome due to ectopic ACTH production.Other carcinomas associatedThymic carcinoid (15%)Islet cell tumour (10%)Bronchial carcinoid (10%)Other carcinoids (5%)Pheochromocytoma (2%)