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Fig. 2B —50-year-old woman with adenocarcinoma in right lower lobe and metastases in right lower paratracheal and subcarinal nodes, which were predicted by helical dynamic CT but not by integrated PET/CT. Transverse conventional (5.0-mm section thickness) enhanced CT scan (A) shows lymph nodes with short-axis diameter of < 10 mm in right lower paratracheal (arrow, A) area, representing benignity with CT size criteria for malignant nodes. This node shows no identifiable ¹⁸F-FDG uptake on PET image (B).