Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral radiographs of the chest . There are new opacities at the left lung base and mid lung field , consistent with pneumonia . Linear opacities at the left lung base are likely atelectasis or scarring . The heart size , hilar and mediastinal contours are normal . Calcified aortic knob is again noted . No pleural effusion or pneumothorax .
    OUTPUT:
    
Increased opacity at the left mid and lower lung fields concerning for pneumonia .