This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Physiology and Pathophysiology - Secondary & Tertiary Hyperparathyroidism, Subject name: Surgery
[{'content': 'Enlargement of pituitary tumor after adrenalectomy is called as? \nSelect and explain. \nA. Nelson s syndrome, B. Steel Richardson syndrome, C. Hamman rich syndrome, D. Job s syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANSWER: (A) Nelson s syndromeREF: Schwartzs Principles of Surgery 9th edition chapter 38. Thyroid, Parathyroid, and Adrenal "Nelson\'s syndrome is the rapid enlargement of a pituitary adenoma that occurs after the removal of both adrenal glands"Approximately 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.', 'role': 'assistant'}]