Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Study is slightly limited by patient rotation . Mild enlargement of the cardiac silhouette is re - demonstrated . The aorta remains tortuous with dilatation of the ascending aortic contour again noted . Pulmonary vasculature is not engorged . Subsegmental atelectasis is noted in the lung bases . No focal consolidation , pleural effusion or pneumothorax is present .
    OUTPUT:
    
Tortuous thoracic aorta with dilated ascending aortic contour , as seen previously . Bibasilar subsegmental atelectasis .