Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . No focal opacity is identified within the bilateral lungs . The patient is status post median sternotomy . Several radiopaque surgical clips are identified within the middle mediastinum . The abdominal aorta is unfolded , similar in appearance when compared to prior examination dated ___ . Allowing for differences in patient positioning , the overall mediastinal and hilar contours when compared to radiograph dated ___ is unchanged . Prominence of the right mediastinum along the right paratracheal stripe may represent vascular ectasia . Pulmonary vessels are unremarkable . There is no pleural effusion or pneumothorax . There is a partially visualized vascular stent in the upper abdomen . No acute osseous abnormality is identified .
    OUTPUT:
    
No convincing signs of pneumonia . Allowing for differences in patient positioning , mediastinal and hilar contours are stable in appearance compared to prior examinations dated ___ . Prominence of right mediastinum along the right paratracheal stripe may represent vascular ectasia . This can be formally evaluated by non emergent chest CT .