My guess is that they said invasive and non-invasive. Most likely your tumor had traits of both, or they found changes taking place from non-invasive to invasive. From what I remember reading back in my days of dx, most tumor have traits of both. Perhaps someone who is more in the know will be able to chime in?
You may also want to look at a book by Dr. Susan Love. Some are not fans of her book, but I found it to be a great deal of info and a great resource. SHe has a chapter about
the path report and you may find parts of it online if you Google her name. It should tell you more about
the invasive/ non-invasive cells.
THe waiting is the hardest part, when you get through this, you'll be ready to conquer the world!