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Figure 2c: Tumor attenuation on transverse CT scans (5-mm section width). (a) Scan obtained through the right middle lobe shows a grade 2 BAC (arrow) with hazy increased attenuation, through which underlying lung architecture can be seen, consistent with a GG attenuation nodule. (b) Scan shows a grade 2 non-BAC adenocarcinoma (arrowhead) in left lower lobe with both GG and solid elements, consistent with a semisolid nodule. (c) Scan obtained through left lower lobe shows grade 3 non-BAC adenocarcinoma (arrow) with solid attenuation and spiculated margins.
