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Display of maximum intensity projections (upper row) and transaxial images (lower row) of both CXCR4- and [18F]FDG-PET/CT (interval between both scans, 6 days) in a patient with recurrent SCLC (patient #4). [68Ga]Pentixafor-PET demonstrates more intense tracer retention in various tumor manifestations including mediastinal lymph nodes (arrows; insert: corresponding contrast-enhanced transaxial CT).
