Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior , there is no significant change . Lung volumes are low . Cardiomediastinal silhouette is unchanged . Streaky bibasilar linear opacities are compatible with atelectasis . There is no evidence of pulmonary edema . Slight blunting of the costophrenic angles bilaterally may be due to trace pleural effusions . There is no pneumothorax . Visualized osseous structures are unremarkable .
    OUTPUT:
    
1 . Slight blunting of the costophrenic angles may be due to trace pleural effusions . 2 . Extensive bibasilar atelectasis , unchanged from prior . No evidence of pneumonia .