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Fig. 3A —70-year-old woman with grade 2 adenocarcinoma; grade 4 is
highest grade. Axial unenhanced CT image at level of right pulmonary artery
shows 8.5-mm spiculated semisolid nodule (arrow) in left upper lobe.
Radiolucency within nodule was confirmed to be air bronchogram on additional
images (not shown).
