Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes , which accentuate the bronchovascular markings . Increased prominence of the mediastinum most likely relates to lower lung volumes however , if there is clinical concern for acute mediastinal process , chest CT is more sensitive and should be considered . Subtle left mid to lower lung opacity may be due to atelectasis , aspiration , or subtle infection . No large pleural effusion or pneumothorax seen . Cardiac silhouette is top - normal . .
    OUTPUT:
    
Low lung volumes accentuate the bronchovascular markings . Increased prominence of the mediastinum most likely relates to lower lung volumes however , if there is high clinical concern for acute mediastinal process , chest CT is more sensitive and should be considered . Subtle left mid to lower lung opacity may be due to atelectasis , aspiration , or subtle infection .