Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta is slightly tortuous . Mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is normal . Apart from subsegmental atelectasis in the lung bases bilaterally , lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . Mild degenerative changes are noted within the imaged thoracolumbar spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .