Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is re- demonstrated . Aortic knob calcifications are present . Mediastinal and hilar contours are unchanged . Mild pulmonary edema is re - demonstrated , not substantially changed in the interval . Low lung volumes with patchy opacities the lung bases may reflect atelectasis . Small bilateral pleural effusions are re - demonstrated , unchanged . No pneumothorax is present .
    OUTPUT:
    
Mild pulmonary edema and small bilateral pleural effusions , unchanged . Bibasilar patchy opacities , potentially atelectasis in the setting of low lung volumes , though infection can not be completely excluded in the correct clinical setting .