Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild right pleural effusion and associated right lower lung atelectasis and left mild - to - moderate effusion with increased retrocardiac density reflecting left lower lung atelectasis is present , and these findings are new since prior radiograph from ___ . Lungs are clear without discrete focal opacities concerning for pneumonia . Mild to moderately enlarged heart size , mediastinal and hilar contours are stable . There is no pulmonary edema .
    OUTPUT:
    
Mild right , mild - to - moderate left pleural effusions and bibasal atelectases , left side more than right , new since ___ .