Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP supine chest film ___ at 08 :01 is submitted .
    OUTPUT:
    
There has been interval complete opacification of the left hemithorax which likely represents a combination of a worsening pleural effusion and lobar collapse , possibly secondary to a mucous plug or increasing effusion . The right lung remains well inflated with prominent interstitium likely reflecting mild interstitial edema . Patient is status post median sternotomy . A tracheostomy tube remains in satisfactory position . The cardiac and mediastinal contours can not be assessed due to the left hemithorax being opacified .