Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate top normal cardiac silhouette . The thoracic aorta is mildly unfolded . Patient is status post median sternotomy and prior CABG . There is subsegmental volume loss in the right mid lung . The lungs are otherwise clear . There is no pneumothorax , vascular congestion , or pleural effusion .
    OUTPUT:
    
No acute cardiopulmonary process such as pneumonia . Top normal heart size .