Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates near complete opacification of the left hemi thorax with leftward mediastinal shift consistent with a massive left pleural effusion and left lung collapse . Stable moderate - large right - sided pleural effusion with compressive atelectasis . No pneumothorax . Assessment of the cardiomediastinal and hilar contours are not possible to assess secondary to large pleural effusion . Chronic left shoulder dislocation and pseudoarthrosis with clavicle again noted .
    OUTPUT:
    
Stable near complete opacification of left hemithorax with leftward mediastinal shift , consistent with massive left pleural effusion and left lung collapse . Stable moderate - large right - sided pleural effusion with compressive atelectasis .