Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are bibasilar airspace opacities . The right - sided opacities appear unchanged , however there is increased retrocardiac opacification on the left . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Multifocal pneumonia with worsening left retrocardiac component .