Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single supine portable chest radiograph demonstrates clear well expanded lungs . There is mild hilar prominence , likely vascular . The heart is normal in size . The mediastinal contours are notable for aortic tortuosity and calcifications . There is no large effusion or pneumothorax . Partially visualized left humeral neck fracture .
    OUTPUT:
    
No acute chest abnormality .