Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased bibasilar opacities since prior , may represent pneumonia or aspiration . Cardiomediastinal silhouette is unchanged . There is no pleural effusion or pneumothorax . Visualized osseous structures are unremarkable .
    OUTPUT:
    
New bibasilar opacities may represent pneumonia , aspiration , or atelectasis .