Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are normal . Aortic knob calcifications are stable . Left base atelectasis appears decreased since the prior exam . No new focal consolidation , pleural effusion , or pneumothorax . Extensive costochondral calcifications are seen .
    OUTPUT:
    
Interval improvement in left base atelectasis . No new consolidation .