Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The inspiratory lung volumes are markedly decreased , which accentuate the interstitial lung markings due to bronchovascular crowding . Within this limitation , there is subtly increased opacification of the left lung base with no correlate on the lateral radiograph which most likely represents atelectasis . There is no focal consolidation concerning for pneumonia . No significant pleural effusion or pneumothorax is detected . The pulmonary vasculature is within normal limits . The cardiac silhouette is accentuated in the setting of low lung volumes but likely within normal limits . The mediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Subtle increased opacification in the left lung base in the setting of low lung volumes , most likely represents atelectasis .