Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient rotation and overlying trauma board slightly limit evaluation . There is complete opacification of the right hemithorax , with mild rightward shift of the trachea . Findings are likely due to a combination of a right pleural effusion and lung collapse . Patient 's known right upper lobe mass is obscured due to the presence of complete whiteout on the right side . A left apical mass is again noted . There are low lung volumes with streaky opacities in left lung base , which may reflect atelectasis . No pneumothorax is identified .
    OUTPUT:
    
Complete opacification of the right hemithorax likely due to a combination of a pleural effusion , right apical mass , and right lung collapse .