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. 2019 Jun 18;195(9):780–791. doi: 10.1007/s00066-019-01480-3

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© The Author(s) 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Primary tumor volume (GTV, gross tumor volume) delineated with manual method and presented on fusion of 18-fluorine-labeled fluorodeoxyglucose positron emission tomography (PET) and magnetic resonance (MRI) images. PET-based GTV (green line) are larger than MRI-based GTV (pink line) and include tumor’s infiltration on the retromandibular triangle (arrow)