A child undergone bilateral adrenalectom, later he developed headache, visual field defect, Hyper pigmentation of skin,what is the most probable diagnosis?: (A) Pitutary adenoma, (B) Allgrove syndrome, (C) Wolman  syndrome, (D) Nelson  syndrome
Answer is D. Nelsom syndrome : 
It is complication after bilateral adrenalectomy due to rapid enlargement of pre - existing ACTH producing adenoma with above clinical features.