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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/).
PET/CT (a) and single-photon emission computed tomography (SPECT) (b) images of the same lesion. PET/CT clearly shows soft tissue inflammation around the ORN area, while SPECT specifically shows bone inflammation. This comparison would help detect tumor recurrence.