Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is complete opacification of the left hemithorax , with mild rightward shift of the mediastinum and trachea . The right lung is well expanded and appears unremarkable . Mild pulmonary vascular congestion is seen in the right lung . There are no pleural effusions on the right .
    OUTPUT:
    
Complete opacification of the left hemithorax , likely secondary to large pleural effusion and / or consolidation .