Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size appears borderline enlarged . Tortuosity of the thoracic aorta is again noted with atherosclerotic calcifications seen at the aortic knob . Convexity at the AP window and left superior mediastinal contour likely reflects known mediastinal lymphadenopathy , better assessed on the previous CT . Lungs are hyperinflated with attenuation of pulmonary vascular markings and bullous changes in the right lung base compatible with emphysema . There has been interval development of a moderate size left pleural effusion . Left basilar opacification may reflect compressive atelectasis , but infection can not be excluded . Known lung nodules are better assessed on previous CT . No acute osseous abnormality is demonstrated .
    OUTPUT:
    
1 . Interval development of moderate size left pleural effusion with associated left basilar opacity , likely compressive atelectasis . Infection , however , can not be completely excluded . 2 . Mediastinal lymphadenopathy , better assessed on the previous CT . 3 . Emphysema .