Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study , there has been development of large opacity projecting over most of the left hemi thorax with mediastinal shift to the left . The left diaphragm is obscured . The right lung is clear . No right pleural effusion is seen . There is no evidence of pneumothorax . The cardiac and mediastinal silhouettes are not well assessed due to the left hemithorax opacification .
    OUTPUT:
    
Interval development of large opacity projecting over the left hemi thorax with mediastinal shift to the left worrisome for lung collapse with possible underlying pleural effusion and consolidation . No pneumothorax seen . Clear right lung . Findings were discussed with Dr . ___ on ___ in person after the conclusion of the study .