Most common cause of ectopic ACTH production-

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%)