Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is unchanged . The aorta remains tortuous and diffusely calcified . The hilar contours are stable , with no evidence of pulmonary vascular congestion . Minimal streaky opacity within the retrocardiac region likely reflects atelectasis . There is no focal consolidation . No pleural effusion or pneumothorax is identified . Multilevel degenerative changes are present within the thoracic spine .
    OUTPUT:
    
Mild retrocardiac atelectasis . No evidence of pulmonary edema .