Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to prior examination , there has been mild improvement of left - sided pleural effusion . There is otherwise no change from prior study with redemonstration of low lung volumes and associated bibasilar atelectasis . Pulmonary vasculature is normal appearing without evidence of fluid overload . There is no pneumothorax .
    OUTPUT:
    
Mild improvement of left pleural effusion . No evidence of fluid overload .