Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright radiographs of the chest demonstrate relatively low lung volumes with bibasilar atelectasis and likely small right pleural effusion . No focal consolidation concerning for pneumonia is identified . Since the prior study , there has been interval improvement in mild interstitial prominence , with no evidence of overt pulmonary edema . There is no pneumothorax . Allowing for portable technique , the heart size is mildly enlarged , but stable compared to the prior study along with a tortuous aorta .
    OUTPUT:
    
Bibasilar atelectasis and likely small right pleural effusion . No evidence of pneumonia or overt pulmonary edema .