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Fig. 6A —Small adenocarcinoma in 49-year-old woman shows net enhancement of 25 H and washout of 5-31 H on dynamic helical CT but negligible ¹⁸F-FDG uptake on integrated PET/CT. Lung window of transverse thin-section (2.5-mm collimation) CT scan shows 9-mm nodule (arrow) in right upper lobe.