Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral infrahilar airspace opacities are nonspecific and appear to have been present on the prior exam in ___ , potentially aspiration and / or atelectasis . No large pleural effusion , pneumothorax , or edema . The heart is normal in size . Mediastinal contours are unchanged . Cervical spine hardware are intact .
    OUTPUT:
    
Bilateral infrahilar opacities overall unchanged could be aspiration and / or atelectasis .