Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild cardiomegaly . The thoracic aorta is unfolded . Right lower lobe interstitial markings are compatible with atelectasis versus scarring . There is no evidence of pneumonia , pleural effusion , or pneumothorax . Old rib fractures are noted on the left as well as on the right .
    OUTPUT:
    
No evidence of pneumonia .