Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate to severe cardiomegaly is re - demonstrated . The aortic knob is calcified . Mediastinal contour is otherwise similar compared with the prior study . Mild pulmonary edema is noted along with a moderate left pleural effusion . Bibasilar airspace opacities may reflect atelectasis . Infection in the left lung base however is not completely excluded . No pneumothorax is demonstrated .
    OUTPUT:
    
Mild pulmonary edema and moderate left pleural effusion . Bibasilar airspace opacities likely reflect atelectasis , however infection in the left lung base can not be excluded .