Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is similar compared to the prior exam . The aorta is tortuous with atherosclerotic calcifications noted at the aortic knob . Mediastinal and hilar contours are otherwise unchanged . The pulmonary vasculature is normal . Patchy opacities are noted in the lung bases , more pronounced on the left , which could reflect areas of atelectasis but aspiration or infection can not be excluded . No pleural effusion or pneumothorax is clearly demonstrated . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Patchy bibasilar airspace opacities , more pronounced on the left . These may reflect areas of atelectasis but infection or aspiration can not be excluded .