News Medical: New treatment guidelines published for anorectal abscess, anal fistula, and rectovaginal fistula New treatment guidelines for anus and rectum issues Anorectal Abscess โ€“ an anorectal abscess is a pus-filled pocket near the anal opening or deeper towards the rectum, caused by bacterial infection. New treatment guidelines published for anorectal abscess, anal fistula, and rectovaginal fistula EurekAlert!: New guidelines address treatment of anorectal abscess, anal fistula, and rectovaginal fistula New guidelines address treatment of anorectal abscess, anal fistula, and rectovaginal fistula