Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Aorta remains mildly tortuous and diffusely calcified . Mediastinal and hilar contours are otherwise unchanged . The pulmonary vascularity is not engorged . Small left pleural effusion is unchanged . There are persistent bibasilar airspace opacities , not significantly changed compared to the prior study . No new parenchymal opacities are visualized . Biapical pleural thickening is re - demonstrated . No acute osseous abnormalities are seen .
    OUTPUT:
    
No significant interval change from prior . Persistent bibasilar airspace opacities likely reflective of acute on chronic bronchitis and bronchiolitis with unchanged small left pleural effusion .