Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One portable AP upright view of the chest . Bibasilar linear opacities likely representing mild chronic fibrotic changes are unchanged . The lungs are overall clear without evidence of consolidation . There is no pneumothorax or pleural effusion . Cardiac , mediastinal , and hilar contours are normal .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Likely mild chronic fibrotic lung changes .