Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are stable with mild to moderate cardiomegaly and tortuous aorta . Patient is status post CABG . The lungs are clear . There is no pneumothorax or pleural effusion . There are mild degenerative changes in the thoracic spine . The sternal wires are intact
    OUTPUT:
    
No evidence of acute or chronic TB