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An Unusual False-Positive Uptake of Radioiodine Caused by Metallic Implants

Liu, Lina MD*; Chen, Yu BS†‡; Tian, Tian MD*; Huang, Rui MD, PhD*; Liu, Bin MD, PhD*

doi: 10.1097/RLU.0000000000002587
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A 36-year-old woman with a history of papillary thyroid cancer underwent radioiodine remnant ablation using 131I. Postablation whole body 131I scintigraphy revealed increased activity not only in the thyroid bed but also in the right upper thigh. SPECT/CT images localized the activity to the metallic implants of the right femur, implanted 3 years earlier after the right femoral cyst resection.

From the Departments of *Nuclear Medicine,

Operation Management,

General Surgery, West China Hospital, Sichuan University, Sichuan, People’s Republic of China.

Received for publication January 28, 2019; revision accepted March 4, 2019.

L.L. and Y.C. contributed equally.

Conflicts of interest and sources of funding: none declared.

Author contributions: All named authors have agreed to the submission and have participated in the study to a sufficient extent to be named as authors. L.L., Y.C., and T.T., manuscript writing and data collection. R.H. and B.L., study design and manuscript editing.

Correspondence to: Bin Liu, MD, Department of Nuclear Medicine, West China Hospital, Sichuan University, 37 Guo Xue Alley, Chengdu 610041, Sichuan, People’s Republic of China. E-mail:

Online date: April 15, 2019

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