Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is within normal limits . The aorta remains tortuous with similar aneurysmal dilatation . Mediastinal and hilar contours are otherwise unchanged . Pulmonary vasculature is not engorged . There has been interval improvement in aeration of the lung bases with decreased atelectasis demonstrated . No new focal consolidation , pleural effusion or pneumothorax is present . Multiple remote bilateral rib fractures and compression deformities are again seen within the imaged thoracolumbar spine . Partially imaged is a stent graft within the abdominal aorta .
    OUTPUT:
    
Improved aeration of the lung bases with residual atelectasis . Otherwise , no substantial interval change from the previous exam performed earlier the same day .