Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is possibly a trace pleural effusion on the left , none on the right . There is no pneumothorax . Streaky opacities in the left lower lobe suggest minor atelectasis . Spinal curvature appears unchanged .
    OUTPUT:
    
Streaky left posterior lobe opacities , probably atelectasis .