Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , similar to the prior exam . There is no focal consolidation , pleural effusion , or pneumothorax . Linear opacity at the bases is likely atelectasis . Cardiomediastinal silhouette is difficult to evaluate in the setting of low lung volumes . Osseous structures are intact .
    OUTPUT:
    
Low lung volumes and linear opacity at the bases , likely atelectasis . No focal consolidation or change from prior exam .