Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrates low lung volumes and mildly engorged pulmonary vasculature compared to ___ , potentially accounted for by the lower lung volumes . There is increased opacity at the posterior costophrenic angle on the lateral view . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Opacity seen in the posterior costophrenic angle on the lateral view , potentially secondary to atelectasis given very low lung volumes on this view . If persistent concern for infection , repeat with improved insiratory effort can be attempted . Patient had been admitted at time of final report with pneumonia among reasons for admission .