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Case Report 


False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series

Mi Ra Kim, Hye-kyung Shim.


Abstract
We present five patients with papillary thyroid carcinoma who underwent total thyroidectomy and received Iodine (I)-131 as ablation therapy. Post-treatment radioiodine scintigraphy with Single Photon Emission Computed Tomography of the lumbar region revealed foci of unusual I-131 uptake in renal cysts. Three of the five patients underwent I-123 whole-body scans (WBS) 6 months later; none of them, including those who underwent sclerotherapy for renal cysts, showed any I-123 uptake. The remaining two patients exhibited no changes in the size or characteristics of the renal cysts on follow-up scans using Fluorine-18 Positron Emission Tomography–Computed Tomography and abdominal Computed Tomography. In one patient diagnosed with multiple simple cysts along with distant metastases to the lung and bone, follow-up scans after the second radioiodine therapy showed partial improvement in other metastatic lesions, whereas multiple renal cysts remained unchanged.
Despite the high incidence of renal cysts, post-therapeutic radioiodine uptake in renal cysts is relatively rare. To the best of our knowledge, there is no reports available on the findings during I-123 WBS follow-up or the second post-radioiodine therapy scan follow-up. Even if uptake is observed on the post-radioiodine therapy scan, it may not be present on I-123 WBS follow-up, necessitating careful interpretation.

Key words: Radioiodine whole body scan, I-131 for ablation therapy, radioiodine uptake in renal cysts, False-positive radioiodine uptake.


 
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How to Cite this Article
Pubmed Style

Kim MR, Shim H. False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series. RMJ. 2025; 50(2): 540-543. doi:10.5455/rmj.20240618125403

Web Style

Kim MR, Shim H. False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series. https://www.rmj.org.pk/?mno=206205 [Access: May 12, 2025]. doi:10.5455/rmj.20240618125403

AMA (American Medical Association) Style

Kim MR, Shim H. False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series. RMJ. 2025; 50(2): 540-543. doi:10.5455/rmj.20240618125403


Vancouver/ICMJE Style

Kim MR, Shim H. False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series. RMJ. (2025), [cited May 12, 2025]; 50(2): 540-543. doi:10.5455/rmj.20240618125403


Harvard Style

Kim, M. R. & Shim, . H. (2025) False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series. RMJ, 50 (2), 540-543. doi:10.5455/rmj.20240618125403


Turabian Style

Kim, Mi Ra, and Hye-kyung Shim. 2025. False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series. Rawal Medical Journal, 50 (2), 540-543. doi:10.5455/rmj.20240618125403


Chicago Style

Kim, Mi Ra, and Hye-kyung Shim. "False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series." Rawal Medical Journal 50 (2025), 540-543. doi:10.5455/rmj.20240618125403


MLA (The Modern Language Association) Style

Kim, Mi Ra, and Hye-kyung Shim. "False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series." Rawal Medical Journal 50.2 (2025), 540-543. Print. doi:10.5455/rmj.20240618125403


APA (American Psychological Association) Style

Kim, M. R. & Shim, . H. (2025) False-positive finding: Iodine (I-131) avid simple renal cysts on post therapy scan in papillary thyroid carcinoma patients - Imaging follow-up – A case series. Rawal Medical Journal, 50 (2), 540-543. doi:10.5455/rmj.20240618125403


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