Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Extensive subcutaneous emphysema persists but is appears to be decreasing over time . Pneumomediastinum is suggested as well , not increasing . Obscuration of the hemidiaphragms appear similar to chest radiograph of the ___ and pneumonia could be contributing to this consolidation . Left upper mediastinal contours unchanged .
    OUTPUT:
    
Bibasilar consolidation appears similar to previous studies and could represent pneumonia .