Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New veil like opacity of the left hemithorax with a crescent of air surrounding the aortic arch and keeping with left upper lobe collapse . The left hilum and mediastinum are enlarged . A small left - sided pleural effusion is seen . The right lung is clear . No pneumothorax . Marked scoliosis convex to the right .
    OUTPUT:
    
Left upper lobe collapse , with large hilar mass and small pleural effusion . No pneumothorax .