I'm sorry, I don't know much about any of that. Here is the cervical cancer group to ask about the endocervical canal MRI:
http://www.medhelp.org/forums/Cervical-Cancer/show/350
I'm purely guessing that 'increased signal' means extra fluid or swelling is there.
Whatever you have might be so rare that no one has considered it. Or you might have two things, which confuses everyone who is looking for a single cause.
Did you travel anyplace exotic? Any opportunity for a strange parasite? Any poisonings? Heavy metals?
The waiting must be terrible for you. Ask the surgeon immediately after the biopsy to give whatever impressions they have from just looking. Sometimes they also do some tests or microscopic evaluation right in the ER, in case they have to do anything additional (like an excision) right then and there.
Sorry I can't be of more help. Please let me know how things turn out for you. Good luck.