Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Aortic knob is mildly calcified . There is mild to moderate pulmonary edema . Bibasilar airspace opacities may reflect atelectasis but is nonspecific and infection can not be excluded . No large pleural effusion or pneumothorax is detected . Small right pleural effusion , however , can not be completely excluded . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild to moderate pulmonary edema with bibasilar airspace opacities likely atelectasis . Infection , however , is not excluded . Small right pleural effusion may be present .