Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . In the bilateral basal airspace opacities over improved somewhat with increased aeration particular the right lung base . Linear atelectasis at the left costophrenic angle . No pleural effusion seen . No pneumothorax seen .
    OUTPUT:
    
Interval improvement in the bibasilar airspace opacities .