Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is improved aeration of the left upper lobe . There continues to be dense opacity in the retrocardiac region compatible with volume loss / infiltrate / effusion . There is hazy opacity projecting over the right lung compatible with right - sided effusion and alveolar edema . An underlying infectious infiltrate ca n't be excluded . ET tube , NG tube , and right - sided PICC line are unchanged .
    OUTPUT:
    
Improved aeration in the left upper lung .