I'm uncertain (1) how you KNOW that the spots are xanthogranulomas [XG], (2) if they're in the choroid
plexus & (3) how long they've been there. Are XGs also present on the skin? Does the pt have Juvenile Xanthogranuloma Disease (JXG)? Choroid plexus XGs don't cause any symptoms but JXG is associated with neuro disease. Diffuse slowing is nonspecific.