Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , PA and lateral . Mild bibasilar atelectasis is present , worse than prior . The heart is mildly enlarged . The aorta is tortuous and calcified . No frank pulmonary edema is present . There is no pneumothorax or pleural effusion . Multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Bibasilar atelectasis , worse compared to the prior exam , without clear evidence for pneumonia .