Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta is tortuous . Mediastinal and hilar contours are otherwise similar compared to the previous study . Pulmonary vasculature is not engorged . Subsegmental atelectasis is noted within the left lung base . No focal consolidation , pleural effusion or pneumothorax is demonstrated . There are moderate multilevel degenerative changes seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .