Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Following left chest tube drain catheter , moderate left pleural effusion has substantially resolved . Small residual left pleural effusion persists . Mild - to - moderate right pleural effusion is unchanged . Heart size is mildly enlarged and stable . Mediastinal and hilar contours are normal . There are no new lung opacities of concern .
    OUTPUT:
    
Following left catheter placement , moderate left pleural effusion has substantially reduced , minimal residual effusion persist . Mild - to - moderate right pleural effusion and mildly enlarged heart size are unchanged .