Fistula formed between a cavernous organ and the outside of the body, or between two cavernous organs to discharge pus, may be congenital formation, or formed after infection, surgery, tumor rupture.
1. congenital factors: that is, abnormal development in embryonic period, part of the tissue or organ development is incomplete, such as vaginal fistula, ear fistula, nasal fistula.
2. Infectious factors: such as perianal infection formed after the abscess breaks out of the formation of anal fistula.
3. Surgical factors: such as appendicitis wound infection after surgery, anastomosis not healing caused by the appendix and the sinus tract outside the body.
4. Tumor factors: rectal fistula formed after the late rupture of rectal tumor.
In the infection formation of abscess and after surgery to pay attention to the protection of the affected area, so as to avoid the formation of fistula, need to be reasonable treatment under the guidance of a professional physician.