Zimmerman, D.D.E.

patient fistula repair healing advancement healing rate anal sphincter stula study outcome transanal fistulous tract flap repair preoperative seton drainage abscess sphincter treatment transsphincteric opening rectum transsphincteric fistulas rectovaginal colon fi stula seton horseshoe tract fistulou failure drainage series extension disease perianal healing rates rectal dis colon rectum blood mucosal smoking result bioglue absorbable sutures surgery preoperative rectal mbf healing time rectovaginal fistulas center effect anal fistula perianal fistulas month course rectovaginal fistula rotterdam colorectal factor intersphincteric horseshoe extension endoanal mr imaging pilot study intersphincteric blood flow imaging horseshoe extensions flap transposition percent cryptoglandular zimmerman difference mucosal advancement flap advancement flap perianal fi stulas mitala transsphincteric fistula anal repair horseshoe extension labial follow-up 5 days