<prompt> Nelson syndrome is seen followingCholecystectomySpleenectomyDuodenectomyAdrenalectomy  <response>: Nelsons syndrome also referred to as post adrenalectomy syndrome occurs following bilateral adrenalectomy in patients with pituitary dependant Cushings syndrome. The common symptoms include: hyper-pigmentation of the skin, visual disturbances, headaches, abnormal high levels of beta-MSH and ACTH, abnormal enlargements of the pituitary glandinvasive pituitary macroadenoma, interruption of menstrual cycles in women.Reference : page 776 Davidsons principles and practice of Medicine 22nd edition 