Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright AP view of the chest was provided . The heart is mildly enlarged . There is subtle bibasilar opacity which represents an early pneumonia versus atelectasis . No large effusion or pneumothorax is seen . Hilar vasculature appears slightly prominent . The bony structures are intact .
    OUTPUT:
    
Subtle bilateral lower lung opacities could represent pneumonia in the correct clinical setting . Mildly enlarged cardiac silhouette .