Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest compared to previous exam from ___ . Low lung volumes again noted . Linear opacity at the right lung base most suggestive of atelectasis . The lungs are otherwise clear . Cardiomediastinal silhouette is within normal limits . Degenerative changes noted at both acromioclavicular and glenohumeral joints .
    OUTPUT:
    
No definite evidence of acute cardiopulmonary process .