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Fig. 2A —74-year-old woman with histologic diagnosis of bronchioloalveolar carcinoma. Axial (A) and sagittal (B) sections of high-resolution CT scan (section thickness, 1.25 mm; section interval, 1.25 mm) show 18.0-mm maximum diameter nodule with focal ground-glass opacity. Mean attenuation of nodule is –399.1 H. Internal air bronchogram (arrows) is seen in nodule.