Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to prior chest x-ray , there has been no significant interval change . Vague opacity projecting over the left lung base laterally is unchanged . On the lateral view , there is more conspicuous opacity over the posterior costophrenic angle which correlates with regions of mucous plugging and tree - in - ___ opacities the right lung base on prior chest CT . There is no new consolidation . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
No significant interval change . Vague left basilar opacity and posterior likely right lung base opacity compatible with changes compatible with multifocal infection as seen on prior exam .