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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Post-radiation inflammatory change. Axial fused FDG PET-CT images of the pelvis. Presacral thickening/stranding (white arrows) that is metabolically active is due to inflammation secondary to radiation. These findings can persist for up to 2 months or more.