Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffuse patchy opacities throughout the left lung are significantly improved compared with ___ . The degree of left lower lobe aeration also appears improved . The right lung is unchanged in appearance , with some linear opacities across the right lung base and coarse interstitial markings likely secondary to chronic nonspecific fibrotic changes . A small left - sided pleural effusion is again seen . Cardiomediastinal and hilar contours are unremarkable . There is no evidence of pneumothorax . A tracheostomy tube and left - sided pacemaker are again seen and unchanged in position compared with prior .
    OUTPUT:
    
Interval improvement in the degree of inflammatory involvement of the left lung as well as left lower lobe aeration .