title: Ectopic thyroid tissue on thallium/technetium parathyroid scan.
abstract: The thallium 201/technetium 99m pertechnetate radionuclide study is becoming widely accepted as a means of localizing abnormal or aberrantly located parathyroid tissue. We describe a case in which ectopic retrosternal thyroid tissue appeared as a parathyroid adenoma on thallium-201/technetium-99m pertechnetate scan. Physicians who use this radionuclide study should be aware of the possibility of false-positive images within the mediastinum.
mesh_terms: D000236:Adenoma / Q000000981:diagnostic imaging; D000328:Adult; D002828:Choristoma / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D010282:Parathyroid Neoplasms / Q000000981:diagnostic imaging*; D011868:Radioisotopes; D011877:Radionuclide Imaging; D013670:Sodium Pertechnetate Tc 99m; D013382:Subtraction Technique; D013793:Thallium; D013961:Thyroid Gland
chemical_list: D011868:Radioisotopes; D013670:Sodium Pertechnetate Tc 99m; D013793:Thallium