Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is near complete opacification of the left hemithorax likely reflective of a combination of large pleural effusion and atelectasis . Heart size can not be assessed due to the presence of the left hemithorax opacification . Dense atherosclerotic calcifications of the thoracic aorta are present . No pulmonary vascular congestion is seen . The right lung is grossly clear . No pneumothorax is noted . No acute osseous abnormalities are visualized .
    OUTPUT:
    
Near - complete opacification of the left hemithorax likely due to a combination of a large left pleural effusion and atelectasis . CT of the chest is recommended to exclude an obstructing central endobronchial lesion .