Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is rotated which limits interpretation of this film . Slight increase in opacity in the left lower lung field is present . Heart size is normal . No pleural effusions are seen . No pneumothorax is seen .
    OUTPUT:
    
Opacity in the left lower lung field , atelectasis vs early pneumonia . PA and lateral films may be helpful for further evaluation .