Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are remarkable for a right cardiophrenic angle opacity corresponding to a large pericardial fat pad on prior chest CT of ___ . . The pulmonary vasculature is normal . Lungs are clear . Attenuation of upper lobe vessels is consistent with known emphysema as demonstrated on prior chest CT . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .