Variable 131I Activity in Renal Stone in a Patient With Thyroid Cancer.

Abstract: A 42-year-old woman underwent 131I radiotherapy for thyroid papillary cancer. A focal elevated 131I activity in the right kidney was revealed on the initial whole-body posttherapeutic images, which was located in the region of a renal stone. However, on the follow-up 131I images acquired 6 months later, there was no longer any increased activity in the region of this stone, which had moved into right ureter. Our case indicates that the 131I activity accumulated in the region of urinary stone is due to stagnated radioactive urine rather than due to the stone per se.
Competing Interests: Conflicts of interest and sources of funding: This work is supported by the Open Program of Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province (no. HYX19026). None declared to all authors.
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