Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Rotational positioning of the patient makes assessment of heart size and lung volume more difficult . However , new mild left lower lobe atelectasis is likely . Small left pleural effusion , if any , is possible . Left upper lobe and right lung are clear . There is no evidence for pleural edema or pneumothorax . The mediastinal and hilar contours are grossly unchanged . ETT , enteric tube and left - sided central line appear unchanged and are in standard position . Aortic knob calcification appear unchanged .
    OUTPUT:
    
New mild left lower lobe atelectasis . Small left pleural effusion , if any .