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 is no pleural effusion or pneumothorax . There is a patchy density obscuring the left hemidiaphragm to a slight degree , although not specific .
    OUTPUT:
    
Patchy left basilar density obscuring the left hemidiaphragm . Pneumonia could be considered versus atelectasis . Short - term followup PA and lateral radiographs may be useful if needed clinically .