Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates well expanded and clear lungs . No focal opacity . No pleural effusion , pneumothorax , or pneumomediastinum . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the osseous structures are notable for multilevel degenerative changes throughout the thoracolumbar spine . Visualized upper abdomen is within normal limits .
    OUTPUT:
    
1 . Normal chest . 2 . No pneumonia , cardiomegaly , pneumothorax or pneumomediastinum .