Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged , increased compared to the previous exam . The mediastinal contour is unchanged . There is mild pulmonary vascular congestion , with increasing patchy opacities in the lung bases . No pleural effusion or pneumothorax is demonstrated . There are no acute osseous abnormalities . Degenerative changes within the thoracic spine with anterior osteophyte formation is re - demonstrated .
    OUTPUT:
    
Mild pulmonary vascular congestion . Patchy bibasilar airspace opacities could reflect atelectasis but infection is not excluded .