Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multifocal bilateral opacities , some improved , some persistent , which were better demonstrated on recent chest CT . Focal nodular opacity in the right lower lung was not identified on prior chest CT and may represent a nipple shadow . The mediastinal contours , cardiac borders , hila are normal . No pleural effusion .
    OUTPUT:
    
Multifocal bilateral opacities without evidence of worsening infection .