This is the most common cause of primary hyperparathyroidism and is benign.

•  Normal glands up to about four in number, 3-4 mm in width, hypoechoic nodules posterior to the thyroid gland (outside of the thyroid capsule).
•  Adenomas cause parathyroid gland enlargement and hyperaemia.

sensitivity of ultrasound in detection of parathyroid adenoma is only 65-85%


•  Technetium-99m sestamibi concentrates in parathyroid adenomas.
•  The test is also useful for detecting ectopic parathyroid adenomas.


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