Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is a stable . Opacities in the left perihilar region have improved . Retrocardiac opacities are unchanged consistent with almost complete collapse of the left lower lobe . Right lower lobe opacities are improving , a combination of small effusion and adjacent atelectasis . There is no evident pneumothorax . ET tube tip is in standard position . NG tube tip is out of view below the diaphragm .
    OUTPUT:
    
Persistent retrocardiac opacities , representing left lower lobe collapse