Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is stable tortuosity of the thoracic aorta . The cardiac silhouette is stable . The hila are unremarkable . There is no focal lung consolidation . There is no pulmonary vascular congestion or pulmonary edema . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Subtle opacity in the region of the lower lobes only seen on lateral view is of uncertain significance . Oblique views of the chest could be obtained for further evaluation if indicated . Otherwise , no evidence of acute cardiopulmonary process elsewhere .