Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal and hilar contours are stable . There is no pleural effusion or pneumothorax . There is continued improvement of the left lower lobe collapse , but atelectasis still remains at the left base . There is no new focal consolidation concerning for pneumonia . Pulmonary vasculature is within normal limits .
    OUTPUT:
    
Improvement in the left lower lobe collapse with no new findings concerning for pneumonia .