Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is within normal limits . Diffuse , reticular interstitial lung markings are chronic . Prominence of the pulmonary vasculature suggests mild fluid overload . There is no pneumothorax or pleural effusion . Osseous structures are unremarkable .
    OUTPUT:
    
Chronic interstitial changes and mild fluid overload .