Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest shows improvement of the right base opacification , now minimal , likely for improved ventilation and reduced atelectasis . Chronic right base pleural effusion is unchanged . New left base linear opacity is due to atelectasis . There are no signs of pneumonia or pulmonary edema . Heart size is normal . Aorta is elongated . There is no pneumothorax . NG tube has been removed .
    OUTPUT:
    
New left base atelectasis . No sign of pneumonia or pulmonary edema . Chronic right base pleural effusion .