Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is a trace pleural effusion on the left , but none on the right . Minimal left basilar atelectasis is noted , but otherwise , the lung fields appear clear . There is no parenchymal edema .
    OUTPUT:
    
Trace left - sided pleural effusion ; otherwise unremarkable .