【正文】
patients with ODS. ( a) as the patient begins to strain an anterior rectocele begins to appear (b) the vagina assumes a horizontal position, the rectocele enlarges, and a small intussusception bees apparent show the intraoperative appearances of a rectocele and anorectal prolapse. ( c ) the internal rectal prolapse increases and descends toward the anal canal ( d ) the internal rectal prolapse plugs the anal canal, the rectocele fails to empty, and plete obstruction to defecation results Dynamic MRI images illustrating the characteristic anatomical abnormalities associated with ODS. ( a ) formation of a large anterior rectocele, ( b ) the vagina assumes a horizontal position, and the rectum evaginates as a rectocele and invaginates as an internal rectal prolapse, ( c ) an enterocele descends to