Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Course throughout the mediastinum . It s tip is not seen . When compared to the examination from ___ there appears to be a progressive worsening of diffuse airspace opacities , most projectional 0 some more confluent areas particular in the right lower lung zone and to the left lower lung zone in the retrocardiac position concerning for developing infection . There is no good evidence of effusion .
    OUTPUT:
    
Findings concerning for developing bibasilar infection .