Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal and hilar contours are unchanged since the prior radiograph . Lung volumes are somewhat low , but clear without pleural effusion or pneumothorax . No focal consolidation . Unchanged linear peripheral opacities in the left upper lung may be due to scarring .
    OUTPUT:
    
No acute cardiopulmonary process .