Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes . Heart size is enlarged . The aorta is calcified , indicating atherosclerosis . There is a left chest pacemaker with electrodes in expected positions . There is perihilar and pulmonary vasculature prominence , concerning for mild edema . Bibasilar atelectasis . Lungs are otherwise clear . There is blunting of the left costophrenic angle , concerning for a small left pleural effusion . No pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild perihilar and pulmonary vasculature prominence , concerning for mild edema . Possible small left pleural effusion .