Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is significant opacification of the left hemi thorax with significant mediastinal shift towards the left , indicative of volume loss . There is hyperinflation of the right hemithorax , which appears clear . A component of left hemithoracic opacification includes pleural fluid , however there is irregular opacification about the left hilum , concerning for a mass . Osseous structures appear intact . No pneumothorax .
    OUTPUT:
    
Significant left hemithoracic opacification with resultant volume loss , concerning for an obstructive / neoplastic process originating in the left hilum .