I'm fairly certain that if one has been on T, and has not had a hysto, and then stops taking T that the voice and any facial hair that has developed will remain, but that the fat distribution will revert back to female and the monthly death will return.
I think that such a person would be considered a female who went through a period of confusion [or an andro individual leaning more towards female] as opposed to a MTF, but really its all situational I suppose.