Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided central venous line again terminates in the mid SVC . Heart size and mediastinal contours are normal . Since the prior radiograph there is a new heterogeneous airspace opacity in the left mid and lower lung . Elevation of left hemidiaphragm indicates that a portion of this opacification may represent atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left mid and lower lung airspace opacification represent pneumonia .