Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph . Unremarkable cardiomediastinal and hilar contours . No focal pulmonary opacifications are evident . A slight prominence of the interstitium is likely exaggerated by low lung volumes , and unchanged across multiple prior radiographs . No pleural effusion or pneumothorax .
    OUTPUT:
    
Normal chest radiograph .