Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . There is been interval development of vague opacities in the lower lobes bilaterally , which likely represent atelectasis and / or pneumonia . There is no evidence of pulmonary edema . Cardiomediastinal silhouette is unremarkable . There is no pneumothorax or pleural effusion . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Interval development of vague opacities in the lower lobes bilaterally , which likely represent atelectasis and / or pneumonia .