Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two upright images of the chest demonstrate mild bilateral pulmonary vascular congestion , unchanged from previous imaging . There is a small new opacity at the left lung base which likely represents atelectasis . Small right pleural effusion is again seen . Left pleural effusion has mostly resolved . Cardiomediastinal silhouette is unchanged . Support and maintenance devices are unchanged .
    OUTPUT:
    
Interval decrease in left pleural effusion and interval increase in left basilar atelectasis . Otherwise , essentially unchanged chest radiograph .