I have heard of pre t.n. but it is fairly new type of t.n. the docs have named. as if t.n. dose not have enough forms as it is. lol it is supposed early stages of t.n. the symptoms are not as bad or as often. as it progress it will get worse and become t.n. or one of the other types atypical bi lat etc....
hope you are doing well sending low pain and
PEACE
BMW