Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , exaggerating the cardiomediastinal contours , however note is made of mild pulmonary vascular congestion . There has been an interval development of mild pulmonary edema . The heart size is normal . Interval improvement in the consolidation at the left lung base , compared to the exam performed 3 hr prior , is suggestive of atelectasis , however an infectious component may be persistent . There is no pleural effusion . There is no evidence of pneumothorax .
    OUTPUT:
    
1 . New mild pulmonary edema . 2 . Interval improvement in the consolidation of the left lung base , compared to the radiograph performed 3 hr prior , is suggestive of atelectasis , however given the mild persistent opacity at the left lung base , an acute infectious process can not be excluded .