Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral basal predominant linear opacities are consistent with patient 's known interstitial lung disease without significant change , or in fact mild improvement from the prior study . No focal consolidation , pleural effusion or pneumothorax is seen . The heart is normal in size with normal mediastinal contours .
    OUTPUT:
    
Chronic fibrotic lung disease without acute process .