Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Subsegmental lower lobe atelectasis noted bilaterally without convincing evidence of pneumonia or edema . No large effusion or pneumothorax . The heart appears mildly enlarged . Mediastinal contour is normal . No bony abnormalities are seen . No free air below the right hemidiaphragm .
    OUTPUT:
    
Subsegmental bibasilar atelectasis .