Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged with a left ventricular predominance . The aorta is diffusely calcified and tortuous . No mediastinal widening is otherwise noted . Pulmonary vasculature is not engorged . Hilar contours are normal . Linear opacities in both lung bases are compatible with areas of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are moderate multilevel degenerative changes seen in the thoracic spine .
    OUTPUT:
    
Subsegmental bibasilar atelectasis .