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. 2022 Mar;63(3):453–460. doi: 10.2967/jnumed.121.262348

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© 2022 by the Society of Nuclear Medicine and Molecular Imaging.

Immediate Open Access: Creative Commons Attribution 4.0 International License (CC BY) allows users to share and adapt with attribution, excluding materials credited to previous publications. License: https://creativecommons.org/licenses/by/4.0/. Details: http://jnm.snmjournals.org/site/misc/permission.xhtml.

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FIGURE 2. — A 52-y-old woman with gastrointestinal tumor was referred for routine ¹⁸F-FDG PET/CT follow-up study. Study was performed 2 d after second COVID-19 vaccination. Selected transaxial CT (A and D) and PET (B and E) slices at level of posterior arm uptake and axillary LNs, fused image (C) at level of posterior arm uptake, and maximum-intensity projection (F) demonstrate moderate-intensity uptake in left posterior arm (thin arrows) (SUV_max, 3.6) and high-grade activity in left axillary nodes measuring 1.0 cm in short axis with benign appearance (thick arrows) (SUV_max, 7.1). Maximum-intensity projection also shows high-grade ¹⁸F-FDG activity in retroperitoneal nodes and multiple implants.