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Rectal fistula
- Anal Abscess and Fistula (American Society of Colon and Rectal Surgeons)... at the external opening suggests a well-established fistula. A digital rectal exam may produce pus from the external opening. ... hospitalization. Consider identifying a specialist in colon and rectal surgery who ... to treat the fistula. WHAT IS A SETON? As mentioned above, if ...