Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest were obtained . Lungs are clear with no focal consolidation , effusion or pneumothorax . There is no evidence of CHF . The heart is mildly enlarged , unchanged from prior exam . The bony structures are intact . There is atherosclerotic calcification of the aortic knob .
    OUTPUT:
    
No acute intrathoracic process .