Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate clear lungs and normal hilar and mediastinal contours . The heart is mildly enlarged but stable . There is no pneumothorax or pleural effusion . The aorta is calcified and unfolded . There are median sternotomy wires in place and multiple surgical clips likely from prior CABG . There is sclerosis of a lower thoracic vertebral body which is unchanged from ___ .
    OUTPUT:
    
No acute cardiopulmonary process .