Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The inspiratory lung volumes remain low in comparison to multiple prior studies . Underinflation of the lungs results in prominence of the cardiomediastinal silhouette and bronchovascular crowding . A focal opacity in the right medial lung base may reflect atelectasis or pneumonia , with mild atelectasis in the left lung base also noted . No pleural effusion or pneumothorax is present . There is no overt pulmonary edema . The cardiomediastinal silhouette is enlarged but stable . The osseous structures are grossly normal , although evaluation is limited secondary to body habitus . Note is made of gaseous distention of the stomach .
    OUTPUT:
    
Low lung volumes . Focal opacity in the right medial lung base could reflect atelectasis or pneumonia , with mild atelectasis in the left lung base .