Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and mediastinal contours are unchanged . There is mild pulmonary vascular congestion . Lung volumes are low leading to bibasilar atelectasis . No pleural effusions are noted , however the diaphgrams are flattened . The known posterior left upper lobe mass is visualized on the lateral view .
    OUTPUT:
    
Mild pulmonary vascular congestion . No definite pleural effusions . Redemonstration of left upper lobe posterior mass .