Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased indistinct opacities at the bilateral lung bases . Elevation of the left hilum is likely related to radiation changes . Adjacent fiducial seeds are unchanged in position . A small , dependent left pleural effusion is essentially unchanged . Pleural fluid tracking into the left major fissure and above the left apex is new . A small right pleural effusion is likely . Heart size is likely top - normal . Cardiomediastinal hilar silhouettes are unchanged .
    OUTPUT:
    
Increased bibasilar opacities may reflect aspiration or multifocal infection . A dependent left pleural effusion is unchanged , though there is new pleural fluid tracking into the left major fissure and above the left apex . The trace right pleural effusion is new .