Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hypoinflated with crowding of vasculature . No pleural effusion or pneumothorax . Cardiomediastinal silhouette is stable with prominence of the superior mediastinum due to a a previously characterized thoracic aortic and left subclavian artery aneurysm . Visualized osseous structures are unremarkable without displaced rib fracture .
    OUTPUT:
    
1 . Low lung volumes . 2 . No acute cardiopulmonary process .