Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Cardiomediastinal silhouette and hilar contours are unremarkable . Patchy bibasilar opacities greater on the left appear slightly progressed compared to prior study . No pleural effusion or pneumothorax .
    OUTPUT:
    
Increasing patchy bilateral opacities suggestive of atelectasis ; however , pneumonia is not excluded given the appropriate clinical setting .