Abstract
A 46-year-old woman underwent 131I radiotherapy following thyroidectomy for papillary thyroid carcinoma. Posttherapeutic 131I scintigraphy was performed 4 days later. Both attenuation-corrected and non-attenuation-corrected 131I tomography images elucidated an intrauterine device with avid 131I uptake in her uterus. This case illustrated that an intrauterine device should be considered as a potential cause of false-positive results in posttherapeutic 131I scintigraphy, highlighting the need for accurate image interpretation to avoid unnecessary treatment.
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