Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest demonstrates interval improvement of interstitial edema and left lung base opacity since the prior study . There is some interval worsening , however , of the right lung base medially , likely representing atelectasis . There is also a small left pleural effusion . The previously seen right and left internal jugular catheters are unchanged in position since the prior exam . There has been interval removal of the nasogastric tube . No pneumothorax is seen .
    OUTPUT:
    
Interval improvement in interstitial edema and left lung base opacity . Mild worsening of right medial lung base , likely representing atelectasis . Follow up radiographs may be helpful to exclude pneumonia .