Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Heart size is mildly enlarged , not substantially changed in the interval . Mediastinal and hilar contours are similar . Pulmonary vasculature is not engorged . Increased interstitial opacities are again demonstrated within the lung bases as well as within the mid lung fields bilaterally , not substantially progressed in the interval . No new focal consolidation , pleural effusion or pneumothorax is identified . Elevation of the right hemidiaphragm is chronic . No acute osseous abnormalities are demonstrated .
    OUTPUT:
    
No substantial interval change in chronic interstitial abnormality most pronounced within the lung bases and mid lung fields .