Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate a mildly enlarged cardiac silhouette . There are diffuse atherosclerotic calcifications of the aorta . There is mild opacification of the left lung base that may represent an area of atelectasis . An old compression deformity of the mid thoracic spine is unchanged .
    OUTPUT:
    
Mild left basilar atelectasis but no definite radiographic evidence of pneumonia .