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Fig. 1C. —Acute pulmonary embolism in 76-year-old woman. Expiratory high-resolution CT scan obtained at same level as B shows air trapping to be associated with mosaic perfusion in both upper lobes. Air trapping in left upper lobe closely corresponds to area of low attenuation seen on inspiratory scan (B). In right upper lobe, area of air trapping appears larger than area of mosaic perfusion seen on inspiratory scan.