in bilateral tn,,it is psysicaly impossible to have two nerve pressing on blood vessels at,, exactly the same time on opposite sides of the head yet they do double mvd surgery,as i have said,,ther is only one kind of tn,,,the rest is just a progression,of the start of tn,,as amonia spreads to other side of brain,,its all a perfect fit,,,thats why my tn responded so well to low proteine,,it is the answer,,who would have thought that sausage can cause tn,,,