Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle left base opacity most likely represents atelectasis and / or vascular structures rather than consolidation . The right lung is clear . There is no pleural effusion or evidence of pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Subtle left base opacity most likely represents atelectasis and / or vascular structures rather than focal consolidation .