Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . Lung volumes are again low , with continued obscuration of the left heart border . These are most likely atelectatic changes in the left lung base . Pulmonary vasculature is normal without pleural effusion . Osseous structures are unremarkable .
    OUTPUT:
    
1 . Continued obscuration of the left heart border favors left lower lung atelectatic changes over pneumonia . Otherwise , stable chest x-ray .