Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volume is low . Mild bibasilar opacities likely reflect atelectasis , although pneumonia is not fully excluded at the left base . Small left pleural effusion is noted . Cardiac silhouette is difficult to assess due to low lung volumes . No displaced rib fracture is identified . Compression deformities of the spine appear similar to before .
    OUTPUT:
    
Evaluation of lung bases is limited due to low lung volumes . The repeat radiograph with improved inspiratory level may be helpful to more fully evaluate left lower lobe opacities to help distinguish atelectasis from infectious pneumonia .