Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Complete opacification of the left hemithorax . The right lung shows no focal consolidation , pleural effusion or congestion . ET tube is in place and ends approximately 5 .1 cm above the carina . The cardiac silhouette is shifted to the left and is obscured by the hemithorax opacification .
    OUTPUT:
    
Complete opacification of left hemithorax likely representing left lung collapse via mucous plug . Unable to rule out pleural effusion . Findings were conveyed to Dr . ___ ___ telephone at 16 :30 on ___ by Dr . ___ ___ following discovery .