PMC4901030_01
13-year-old female with pectus excavatum. A. Posteroanterior radiograph. B. Lateral chest radiograph.
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The PA radiograph revealed symmetric lung volumes with an apparent increased density overlying the right anteromedial aspect of the right middle lobe (Fig. 1A). The lateral radiograph revealed an opacity (the sternum) that filled the retrosternal air space, creating an edge that overlay a portion of the cardia (Fig. 1B).
13-year-old female with pectus excavatum. Noncontrast CT of the chest, with measurements for Haller index.
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The CT of the chest revealed a Haller index (see Discussion below for information on this index) of 3.90 (Fig. 2).