Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the study of several hours prior , lung volumes remain extremely low . Cardiomediastinal silhouette is within normal limits . Multiple bilateral rounded opacities have progressed compared to the prior study . There is no large effusion or pneumothorax .
    OUTPUT:
    
Progression of multiple bilateral rounded opacities raises concern for multifocal pneumonia or septic emboli .