Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There are streaky perihilar opacities most suggestive of minor atelectasis which could accompany air inflammation . The chest is mildly hyperinflated . There is no pleural effusion or pneumothorax . Bony structures are unremarkable aside from mild irregularities along mid thoracic endplates , probably degenerative .
    OUTPUT:
    
No definite evidence of acute disease . Streaky perihilar opacities , which suggest minor atelectasis , best depicted on the lateral view . Mild mid thoracic degenerative changes .