Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ___ ___ , left lower lung atelectasis and presumed mild left pleural effusion are new . The right lung is clear . There are no lung opacities concerning for pneumonia . The heart size , mediastinal and hilar contours are normal .
    OUTPUT:
    
Minimal left lower lung atelectasis and presumed small left pleural effusion , new since ___ . No lung opacities concerning for pneumonia .