Role of Single Photon Emission Computed Tomography/Computed Tomography in Localization of Ectopic Parathyroid Adenoma

The parathyroid glands are located posterior to the upper and lower poles of the thyroid and are derived from the third and fourth pharyngeal pouches. Usually there are only 2 superior glands, whereas only 40% of patients have their inferior glands located near the inferior thyroid poles. Ectopic locations include the carotid sheath, anterior mediastinum, retropharynx, or intrathyroidal locations. Single photon emission computed...