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| | UpToDate Rectovaginal, anovaginal, and colovesical fistulas |
 | | Rectovaginal fistulas may also result from difficult hysterectomies, especially those performed for severe endometriosis with involvement or obliteration of the cul-de-sac, and from surgical procedures involving the posterior vaginal wall, perineum, anus, and rectum. |
 | | Most anovaginal and rectovaginal fistulas of obstetric origin are located in the lower third of the vagina, just inside the introitus. |
 | | Although concomitant sphincter injury has been reported to exist in up to one-third of women presenting with rectovaginal fistulas [1,2], concomitant internal or external sphincter injuries (or both) are probably more frequent when the location of the fistula is within the distal 3 cm of the anal canal. |
| patients.uptodate.com /topic.asp?file=gyn_surg/13639 (490 words) |
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