Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta is tortuous and calcified . Hilar contours are unremarkable and the pulmonary vasculature is not engorged . There is patchy retrocardiac atelectasis without focal consolidation . No pleural effusion or pneumothorax is present . Moderate to severe multilevel degenerative changes are re - demonstrated in the thoracic spine .
    OUTPUT:
    
Mild patchy retrocardiac atelectasis .