Interesting Images: PDF OnlyTc-99m MIBI Accumulation in Remnant Thymus A Cause of False-Positive Interpretation in Parathyroid ImagingMUDUN, AYSE M.D.; KOCAK, MEHMET M.D.; UNAL, SEHER M.D.; CANTEZ, SEMA M.D. Author Information From the Department of Nuclear Medicine, Faculty of Medicine, Istanbul University, Istanbul, Turkey Clinical Nuclear Medicine: April 1995 - Volume 20 - Issue 4 - p 379-380 Buy Abstract A 17-year-old boy, who was suspected of having hyperparathyroidism, was admitted for parathyroid imaging. Tc-99m pertechnetate Tc-99m MIBI subtraction scintigraphy was performed. A focal increased activity accumulation was observed visually after Tc-99m MIBI injection in the lower left lobe of the thyroid extending inferiorly, which was interpreted as parathyroid adenoma. At surgery, a left thyroidectomy was performed and no parathyroid abnormality was observed, but a 3 ± 2 ± 3 cm mass, which was thought to be a thymic remnant, was removed. Histopathologic examination of this specimen revealed an involuted thymic tissue. Three months after surgery, Tc-99m MIBI imaging was repeated and no activity accumulation was seen in the neck. © Lippincott-Raven Publishers.
