CXCR4 and sarcoidosis: Transbronchial fine-needle aspiration of a paratracheal lymph node (red star; [18F]FDG, SUVmax = 4.77; [68Ga]Ga-CPCR4.2, SUVmax = 7.18) revealed no signs of lymphoma infiltration but characteristic epithelioid cell granulomas with pronounced CXCR4-expression in the surrounding rim of activated lymphocytes (C), consistent with the diagnosis of sarcoidosis, a multisystem inflammatory disorder of enormous heterogeneity in clinical presentation [4].