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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Most sensitive investigation for preoperative localization of abnormal parathyroid glands is:
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The correct answer is  Neck ultrasound locates glands in approximately 75% of cases. (99mTc) labeled Sestamibi isotope scans identify approximately 80% of abnormal parathyroid glands.
CT & MRI is not indicated prior to first time neck exploration.