Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is unchanged . The aorta is diffusely calcified . The mediastinal and hilar contours are unchanged . The pulmonary vascularity is not engorged . There is streaky opacities at the lung bases likely reflective of atelectasis . Minimal blunting the right costophrenic angle suggests a trace pleural effusion . No pneumothorax is identified . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis with possible trace right pleural effusion .