Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral images of the chest demonstrate marked improvement in the vascular congestion seen on previous imaging . A small left pleural effusion is seen . There is an opacity , best seen on the lateral view , in the retrocardiac space which suggests a left lower lobe pneumonia or possibly atelectasis . There is no pleural effusion on the right . There is no pneumothorax . Cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Improvement in previously seen diffuse vascular congestion . Retrocardiac opacity concerning for left lower lobe pneumonia or possibly atelectasis . Left pleural effusion . These findings were communicated via Radiology Critical Findings Dashboard at 4 :53 p .m .