Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes , but the lungs are clear . Slightly enlarged - appearing heart likely due to magnification from AP projection . Cardiomediastinal silhouette is otherwise unremarkable . There is no pneumothorax or pleural effusion . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Normal chest radiographs .