Up from the essence of anal fistula is a kind of sequelae of anorectal abscess so anal fistula formation must be the result of the developme
Up from the essence of anal fistula is a kind of sequelae of anorectal abscess so anal fistula formation must be the result of the development of infection. The formation of anal fistula generally experienced the following four stages:
The first stage: Anal sinus, anal ringworm, anal gland infection, at the beginning only localized inflammation, if not timely treatment or systemic immune function, inflammation can spread around the anus.
The second stage: the formation of anorectal inflammation, if inflammation is still not controlled, it can spread to the interstitial space.
The third stage: the formation of perianal abscess, there are swelling and heat pain of the four characteristics, some patients can also fever, general malaise.
The fourth stage: very few perianorectal can be completely dissipated were cured without sequelae, but most of the abscess or incision and drainage, gradually form a fistula. The first is the pus cavity gradually reduced, and then continue to form a hard wall pipe of connective tissue hyperplasia, the gap between the left and the fistula.
Goligher and others believe that although anal gland infection can in the formation of abscess and anal fistula around the anus and rectum plays an important role, but not only, many factors can cause abscess or fistula. These factors include anorectal injury, anal perineal surgery, recurrent infections, tuberculosis, ulcerative colitis, Crohn's disease, anorectal cancer, blood infection, lymphogranuloma, actinomycosis, sacrococcyx osteomyelitis, rectosigmoid colon diverticulum yan.
(Ningbo anorectal Hospital Peng Lianming ninth)