Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Re - demonstrated are diffuse interstitial opacities most prominent in the lung bases , left greater than right . Findings are consistent with chronic underlying interstitial lung disease . As compared to multiple prior examinations , the severity is similar , therefore no definite superimposed edema or infection is evident . There is stable blunting of the bilateral costophrenic angles , which appears slightly improved from prior and likely related to chronic pleural thickening . No definite effusion is evident . There is no definite new consolidation . No pneumothorax is evident . Cardiomediastinal and hilar contours are within normal limits and unchanged . Re-demonstrated are calcifications of the aortic arch and descending aorta . There is mild unchanged cardiomegaly . Circumscribed rounded densities overlying the heart on the lateral view may represent something outside of the patient . Degenerative changes of the thoracic spine are similar to prior .
    OUTPUT:
    
Chronic interstitial lung disease , though no gross evidence for superimposed pneumonia or edema .