Anorectal Malformations: Introduction and Overview for bowel management
With Dr. Dr. Todd Ponsky · StayCurrentMD
Educational content from recorded physician discussions — not medical advice. Talk to your (or your child's) care team about your situation.
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What the experts said
Since 1980, approximately 75% of patients operated for anorectal malformations achieve acceptable bowel control, though never perfect.
At least 25% of patients are born with malformations so complex and severe that they suffer from permanent fecal incontinence, as surgeons have not learned how to create nerves or muscles.
Functional prognosis for anorectal malformations can be determined in the first few days of life based on long-term follow-up data.
In the first days of life, clinicians should determine the specific functional prognosis for bowel control, urinary control, and sexual function for each anorectal malformation patient.
Perineal fistula patients have 100% chance of bowel control by age 3, provided they have a normal sacrum.
Perineal fistula, despite being the most benign malformation, suffers from the worst constipation of all anorectal malformations.
Constipation produces fecal incontinence.
Presacral masses are more common in perineal fistula defects and change the prognosis completely when present with a hemisacrum.
In female perineal fistula, constipation is incurable but manageable.
Patients with perineal fistula develop overflow pseudo-incontinence if constipation is not aggressively managed.
Perineal fistula patients are born with constipation and will have it with or without operation.
All babies with anorectal malformations should have an ultrasound of the spine in the first 3 months of life.
Rectal vestibular fistula is by far the most common defect in females.
95% of rectal vestibular fistula patients with good sacrum and no tethered cord achieve bowel control.
70% of rectal vestibular fistula patients have constipation.
In rectal vestibular fistula, the rectum and vagina share a very thin common wall, and the surgical challenge is making two walls out of one.
Anorectal malformation without fistula occurs in only 5% of all cases.
Half of patients with anorectal malformation without fistula have Down syndrome.
95% of Down syndrome babies with anorectal malformations have the no-fistula type defect.
80% of Down syndrome patients with anorectal malformations achieve bowel control, contradicting the practice of permanent colostomy for these patients.
90% of non-Down syndrome patients with anorectal malformation without fistula achieve bowel control.
All patients with anorectal malformations have two enemies: constipation and diarrhea.
Patients with anorectal malformations will most likely not reach the bathroom during severe diarrhea episodes, unlike normal individuals who sometimes struggle.
Rectal urethral bulbar fistula is the most common defect in male patients.
85% of rectal urethral bulbar fistula patients achieve bowel control, provided they have a good operation, good sacrum, and no tethered cord.
Laparoscopy is contraindicated in rectal urethral bulbar fistula because laparoscopists cannot reach the low pelvis, resulting in more posterior urethral diverticulums being left behind.
60% of rectoprostatic fistula patients have voluntary bowel movements by age 3.
In rectoprostatic fistula, laparoscopy could be good if the surgeon is a skilled laparoscopist.
Rectal bladder neck fistula occurs in about 10% of all anorectal malformation cases.
Only 20% of rectal bladder neck fistula patients have voluntary bowel movements by age 3.
Rectal bladder neck fistula is the ideal case for laparoscopy because it is easy to reach from above, avoids laparotomy, and the rectum-bladder neck connection has no common wall allowing literal ligation of the fistula.
Attempting to ligate the fistula in rectoprostatic or bulbar fistulas may cause significant damage because they have a common wall, unlike bladder neck fistula.
The percentage of associated defects in anorectal malformations runs mathematically with the spectrum: perineal fistula has 15% chance, bladder neck fistula has 90% chance, with everything in between proportional.
Associated defects in anorectal malformations are mainly urological, second orthopedic, then gastrointestinal, with concern increasing as the malformation is higher.
Based on experience with over 570 cloacas, bowel control possibilities depend very much on sacral quality, while urinary control depends more on common channel length.
The turning point for cloacal prognosis is a common channel of approximately 3 centimeters.
With common channel shorter than 3 centimeters, 70% of cloacal patients have urinary control.
With common channel over 3 centimeters, only 20% of cloacal patients have urinary control; the other 80% need intermittent catheterization to empty the bladder.
When cloacal common channel is shorter than 3 centimeters, young general pediatric surgeons can be trained to repair the malformation because the operation is reproducible.
When cloacal common channel is longer than 3 centimeters, the malformation is very complex and requires extensive experience in both pediatric surgery and pediatric urology, and there are not enough cases to train everyone.
Cloacal exstrophy patients will have terrible quality of life regardless of treatment, but most are very intelligent, charismatic, and lovely children.
About 15-20% of cloacal exstrophy patients have voluntary bowel movements.
Urinary control is out of question for cloacal exstrophy patients; they will need intermittent catheterization for life because most need bladder reconstruction and a Mitrofanoff.
Most cloacal exstrophy patients have different degrees of colon shortness.
A human being with no colon will have liquid stool for life.
Bowel management cannot be done with liquid stool.
The most important formal contraindication for pull-through is incapacity to form solid stool.
Meningocele, bladder neck fistula, and tethered cord are NOT contraindications for pull-through, contrary to common surgical practice.
If a patient is capable of forming solid stool, by definition they are a good candidate for bowel management.
Even if a patient has good sphincter, if they have no colon, they should never have a pull-through because bowel management doesn't work.
It is contraindicated to do a pull-through in anorectal malformation if the patient is incapable of forming solid stool, unlike in Hirschsprung total colonic aganglionosis, familial polyposis, or ulcerative colitis where patients have normal sphincter and anal canal.
Cloacal exstrophy patients have different degrees of colon shortness ranging from zero colon to normal colon.
The surgeon's obligation with cloacal exstrophy newborns is to separate GI tissue from urinary tissue, incorporate all GI tissue into a single tube, and open an end colostomy.
The most common neonatal error in cloacal exstrophy is opening an ileostomy and leaving a piece of colon attached to the urinary tract.
Colon left attached to urinary tract will not grow, will not develop water absorption capacity, will absorb urine, and will provoke hyperchloremic acidosis that interferes with patient growth and development.
Even a tiny piece of colon in cloacal exstrophy will grow and develop more water absorption capacity over time.
Do not resect any piece of colon in patients with anorectal malformations; every piece of gastrointestinal tissue is extremely valuable for water absorption, bladder reconstruction, and vaginal reconstruction.
In cloacal exstrophy, do not let urologists use gastrointestinal tissue for reconstructions without first deciding whether the patient has enough GI tissue for a pull-through—that is the priority.
Bowel management through the stomach simulates the stomach as the future anus by giving enemas through a gastrostomy to determine if the patient can stay clean for 24 hours, indicating suitability for pull-through.