Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Mediastinal contour is within normal limits . Extensive alveolar opacities are noted bilaterally in a perihilar distribution , more pronounced on the left . Small bilateral pleural effusions are noted . No pneumothorax is seen . There are hypertrophic changes seen in the imaged thoracolumbar spine . Multiple clips are noted along the left superior mediastinum compatible with prior thyroidectomy .
    OUTPUT:
    
Diffuse bilateral alveolar opacities concerning for multifocal pneumonia . Small bilateral pleural effusions .