Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A known left hilar mass has continued to decrease and is hardly apparent . The heart is normal in size . Patchy calcifications are noted along the aortic arch . There is no pleural effusion or pneumothorax . Mild coarsening of background interstitial markings appears unchanged but there is no focal new opacity .
    OUTPUT:
    
Continued decrease in known left hilar mass without definite evidence for acute disease .