Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Markedly improved aeration of left lower lobe . Improvement in bilateral perihilar and right infrahilar opacities with residual heterogeneous opacities remaining . Small , residual bilateral pleural effusions . Normal cardiomediastinal and hilar contours .
    OUTPUT:
    
Improving multifocal pneumonia . Small , residual bilateral pleural effusions .