Fetal Adenoma of the Thyroid A Common Source for False-Positive Thallium-201/ Technetium-99m Pertechnetate Subtraction Parathyroid Scintigraphy

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Abstract
The specificity of thallium/technetium imaging for the localization of parathyroid tumors has remained high. False-positive findings usually arise from an incorrectly perceived mismatch. In these case reports, false-positive findings resulted from the presence of intrathyroidal fetal adenomas. Benign thyroid adenomas appear to represent a common source of false-positive finding for parathyroid tumor in thallium/technetium imaging.