<prompt> Enlargement of pituitary tumor after adrenalectomy is called as?Nelson s syndromeSteel Richardson syndromeHamman rich syndromeJob s syndrome  <response>: ANSWER: A Nelson s syndromeREF: Schwartzs Principles of Surgery 9th edition chapter 38. Thyroid, Parathyroid, and Adrenal Nelsons syndrome is the rapid enlargement of a pituitary adenoma that occurs after the removal of both adrenal glandsApproximately 30 of patients who undergo bilateral adrenalectomy for Cushings disease are at risk of developing Nelson s syndromefrom progressive growth of the pre-existing pituitary tumor. This leads to increased ACTH levels, hyperpigmentation, visual field defects, headaches, and extraocular muscle palsies. 