Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral widespread ground - glass opacities are unchanged . The mediastinal contour is normal . Cardiac contour is top normal . There is no pleural effusion or pneumothorax . Previous surgery of the cervical spine is seen .
    OUTPUT:
    
Unchanged bilateral ground - glass opacities presumed to be from pneumocystis infection .