Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are unchanged compared to the prior study . The trachea is central . The heart remains enlarged . There is persistent enlargement of the bilateral hila and upper lobe pulmonary vasculature , in addition there is perihilar airspace opacity consistent with pulmonary edema . This is slightly more prominent than on the prior study . Left lower lobe atelectasis . No definite pleural effusion seen . No pneumothorax seen .
    OUTPUT:
    
Pulmonary edema slightly progressed when compared to the prior study . Unchanged cardiomegaly . No pleural effusion seen .