Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal lung volumes . Unusual tubulated shape of the upper mediastinum and azygos enlargement are unchanged since ___ . The diminutive inferior vena caval contour on the lateral view is an indication that the mediastinal appearance is due to venous anomalies such as hepatic interruption of the inferior vena cava , of no clinical significance . However there is also a lateral bulge in the margin of the descending thoracic aorta , that is larger today . That could also be unimportant , such as dilated accessory hemiazygos vein or even hiatus hernia . I discussed the lesser possibility of aortic pathology with Dr ___ , ___ the appropriate use of CTA in the workup of this patient 's chest pain at 8 am . No pleural effusion , focal consolidation or pneumothorax . Heart size is normal . No pulmonary edema .
    OUTPUT:
    
See discussion of mediastinal abnormalities above .