Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior , there is no relevant interval change . Allowing for image under penetration the lungs appear clear . Lung volumes are low . Cardiomegaly is unchanged . Mediastinal contour is stable . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
No relevant change in the appearance of the chest since ___ .