Been reading some stuff about treating fistulas and thought I'd post it here in case anyone else is ever interested:
Using Flagyl to treat fistulas
http://www.ncbi.nlm.nih.gov/pubmed/3053871
Incision and drainage of perianal abscesses with and without fistulotomy at the same time (very good article with pictures and everything if you scroll down a few pages)
http://books.google.com/books?id=4ZEeXDuknU0C&pg=PA274&lpg=PA274&dq=primary+fistulotomy&source=bl&ots=_exmYfsTJK&sig=Egl_7EkyfhWucZ9EEsR8J33lIU8&hl=en&ei=C2LzS_moN5SKsgPetq3-Cw&sa=X&oi=book_result&ct=result&resnum=6&ved=0CD8Q6AEwBQ#v=onepage&q=primary%20fistulotomy&f=false