Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is top - normal in size . Lung volumes are low which accentuates bronchovascular markings . There is no evidence of pulmonary edema . Subtly increased density within the left lower lobe could represent infection or atelectasis . In addition , there is subtle increased opacity at the right mid lung laterally overlying the anterior right third rib . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes . Subtly increased opacity within the left lower lobe likely atelectasis . More focal opacity in the right mid lung laterally , nonspecific . Consider repeat with improved inspiration to further characterize this findings exclude underlying parenchymal opacity or possible nodule . If it persists , CT scan should be considered .