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. 2021 Mar 29;11(4):605. doi: 10.3390/diagnostics11040605

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© 2021 by the authors.

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 (http://creativecommons.org/licenses/by/4.0/).

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Displayed are Maximum Intensity Projections (MIP) of the ¹⁸F-FDG (left) and ⁶⁸Ga-Pentixafor PET scans of patient #2. Whereas ¹⁸F-FDG depicts the ileal primary (black arrow) as well as multiple liver metastases (white arrow), none of the tumor manifestations are revealed by CXCR4-directed PET imaging. Incidental finding: The mediastinal tracer uptake in ⁶⁸Ga-Pentixafor PET (white star) was traceable to enlarged mediastinal lymph nodes, most likely due to chronic lung fibrosis and not related to NEC, as follow-up imaging confirmed.