Figure 4: Schematic illustration of the picture in Figure 1 showing opening of the posterior rectal wall; it is first part of the York Mason posterior transrectal transsphincteric procedure. (a) Incision line is seen. (b) After opening skin and subcutaneous tissue, gluteus and anal sphincter muscles are seen. (c) Incised anal sphincter muscles and posterior rectal wall are seen. (d) After opening posterior rectal wall, the rectourethral fistula (RUF) and urethral catheter are seen.