Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume but clear . The cardiac silhouette is mildly enlarged . The mediastinal silhouette and hilar contours are normal . Blunting of the right costophrenic angle could be related to an effusion . Sternotomy wires and clips from a CABG are noted . A metallic density is noted in the left upper quadrant . Note is made of a calcified thoracic and abdominal aorta .
    OUTPUT:
    
No acute intrathoracic process . Possible trace effusion on the right .