Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . The cardiac silhouette size remains unchanged and normal . Mediastinal and hilar contours are similar . No pulmonary edema is overtly demonstrated . Diffuse interstitial abnormality is compatible with known chronic interstitial lung disease which is more pronounced in the lung bases . Minimal patchy opacity within the left lung base may reflect superimposed atelectasis . No pleural effusion or pneumothorax is identified . No displaced fractures are present .
    OUTPUT:
    
No substantial interval change in the appearance of chronic fibrosing interstitial lung disease . Patchy opacity in the left lung base may reflect superimposed atelectasis .