Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged but similar . Mediastinal and hilar contours are relatively unchanged . There is mild pulmonary vascular congestion . Streaky and patchy ill - defined opacities in both lung bases are new compared to the prior chest radiograph , and may reflect areas of infection , aspiration or atelectasis . A small left pleural effusion may be present . There is no pneumothorax . No acute osseous abnormalities are detected .
    OUTPUT:
    
Mild pulmonary vascular congestion with new bibasilar airspace opacities , nonspecific , possibly reflecting atelectasis though aspiration or infection can not be excluded . Possible trace left pleural effusion .