Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Streak like linear opacities in the left lower lobe is most likely atelectasis . No focal consolidation , edema , effusion , or pneumothorax . The heart is normal in size . The mediastinum is not widened . Left lateral seventh rib fracture is again noted .
    OUTPUT:
    
Left lower lobe atelectasis . No focal pneumonia .