Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . A left - sided pacer and dual leads are in appropriate and unchanged position . Sternotomy wires are unchanged . Subtle opacities at the lung bases likely reflect atelectasis . Scarring noted at the left lung apex . There is no consolidation or pleural effusion . There is no pneumothorax . Compression deformity in the lower thoracic spine is unchanged from prior CT .
    OUTPUT:
    
Subtle bibasilar opacities likely reflects subsegmental atelectasis . No consolidation or effusion .