Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomegaly is stable . The cardiomediastinal and hilar contours are within normal limits . The aorta is unfolded as before . Minimally increased opacity at the base of the right lung is similar in appearance to the most recent prior examination in ___ and may reflect atelectasis or infection in the appropriate clinical setting . Minimal atelectasis at the base of the left lung . No pneumothorax or pleural effusion .
    OUTPUT:
    
Bibasilar opacities likely reflect atelectasis however infection should be considered in the appropriate setting .