Figure 6b. Localized bronchioloalveolar carcinoma in a 49-year-old woman. (a) Thin-section CT image obtained at the level of the right bronchus intermedius shows a 14-mm well-defined nodular ground-glass opacity with a solid component (arrow) in the lower lobe of the right lung, abutting the vertebral body. (b) Photomicrograph of a histologic specimen (original magnification, x40; hematoxylin-eosin stain) shows replacement-type tumor cell growth, as well as foci of fibroblastic proliferation and alveolar collapse (arrowheads).