Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Mild cardiomegaly is similar . The aorta remains tortuous , and the mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . There is minimal atelectasis at the lung bases without focal consolidation . No pleural effusion or pneumothorax is detected . Degenerative changes are seen throughout the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .