Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged , unchanged . Mediastinal hilar contours are within normal limits . Left basal atelectasis is again noted . There is no focal consolidation to suggest pneumonia . No pleural effusion or pneumothorax . Old bilateral rib fractures identified .
    OUTPUT:
    
Unchanged mild cardiomegaly and basilar atelectasis . No evidence of pneumonia or pneumothorax .