<prompt> A child undergone bilateral adrenalectom, later he developed headache, visual field defect, Hyper pigmentation of skin,what is the most probable diagnosis?Pitutary adenomaAllgrove syndromeWolman syndromeNelson syndrome  <response>: Nelsom syndrome : It is complication after bilateral adrenalectomy due to rapid enlargement of pre - existing ACTH producing adenoma with above clinical features. 