Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mild to moderately enlarged , unchanged . The aorta remains tortuous and diffusely calcified . Mediastinal and hilar contours are otherwise unremarkable . There is mild pulmonary vascular congestion , somewhat improved compared to the previous exam . No pleural effusion or pneumothorax is demonstrated . Linear opacities within the left lung base may reflect atelectasis . Multilevel moderate degenerative changes are seen in the thoracic spine . Clips are noted projecting over the left lower hemithorax .
    OUTPUT:
    
Mild pulmonary vascular congestion and left basilar atelectasis .