Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimal patchy opacity at both lung bases medially is suggestive of atelectasis . No focal consolidation identified . There is no pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is stable . Mild unfolding of the aorta is similar to the prior study . Increased lung volumes on the lateral view radiograph compared with the prior study are associated with improved aeration in the lung bases .
    OUTPUT:
    
Probable bibasilar atelectasis . Otherwise , doubt acute pulmonary process .