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Figure 16a.  Congenital lobar emphysema. (a) Schematic illustrates congenital lobar emphysema. (b) Posteroanterior chest radiograph shows a lucent mass in the right upper lobe (arrows) that displaces mediastinal structures to the left. (c) Lateral view shows a hyperlucent retrosternal area (arrows) that corresponds to the lobar emphysema.