Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits and unchanged since prior examination . Again noted is a thick band of atelectasis at the left lung base with smaller atelectatic changes bilaterally . There is no new focal consolidation . No definite vascular congestion or pleural effusions . There is no pneumothorax . Multiple rib fractures are again noted along the left .
    OUTPUT:
    
Stable atelectatic changes bilaterally with no acute cardiopulmonary process .