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Figure 6a.   Segmental bronchial atresia in a 17-year-old girl. (a) Close-up posteroanterior radiograph of the right lower lung shows a nodular area of increased opacity in the lower lobe (arrow). (b) Chest CT scans (image on left obtained at a lower level) show a branching tubular area of increased attenuation in the right lower lobe as well as pulmonary parenchyma with lower than expected attenuation. These findings are characteristic of segmental bronchial atresia and obviated further work-up.