Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , with no focal consolidation . Subsegmental bibasilar atelectasis , most pronounced on the right , is minimarlly changed dating back to ___ . The cardiomediastinal silhouette has not significantly changed . A tortuous thoracic aorta is again noted . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No radiographic evidence for pneumonia . Bibasilar subsegmental atelectasis , unchanged .