Anorectal malformations are birth defects where the anus and rectum do not develop properly. They occur in about 1 in 4,000 live births. The document discusses the various types of anorectal malformations including rectoperineal fistula, rectourethral fistula, and imperforate anus without fistula. It covers the embryology, classification systems, clinical features, investigations, and surgical management protocols for repairing defects in both male and female newborns. The posterior sagittal anorectoplasty technique is emphasized as the standard approach for repair.
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2. Introduction
Birth defects in which the anus and rectum don’t develop properly.
More frequent congenital anomalies encountered in pediatric
surgery.
Incidence : 1 in 4000 live births
Male > female
3. Introduction
In female: Rectovestibular fistula is the most common
In male: Rectourethral fistula is the most common
Imperforate anus without fistula: 5%
Estimated risk of 2nd child being affected is 1.4%
Risk increases to 3% if first child is born with perineal or vestibular
fistula
4. Introduction
Most female have low or intermediate anorectal malformations
while the reverse is true for males.
Female babies usually have a fistula from the terminal end of the
bowel opening externally
While in male this fistula is usually well hidden.
5. Embryology
The hindgut gives rise to:
distal third of transverse
colon, the descending colon,
the sigmoid, the rectum and
upper part of anal canal
6. Embryology
Hindgut enters the posterior
portion of cloaca, the future
anorectal canal; the allantois
enters the anterior portion, the
future urogenital sinus.
The urorectal septum is formed
by merging of the mesoderm
covering the allantois and the
yolk sac.
7. Embryology
As caudal folding of the embryo
continues, the urorectal septum
moves closer to the cloacal
membrane.
8. Embryology
Breakdown of the cloacal
membrane creates an opening for
the hindgut and one for the
urogenital sinus.
The tip of the urorectal septum
forms the perineal body.
9. Embryology
Anorectal malformations may be caused by abnormalities in
formation of cloaca and/or urorectal septum.
For example, if the cloaca is too small or urorectal septum does not
extend far enough caudally, the opening of hindgut shifts to
anteriorly leading to the opening in urethra or vagina.
Imperforate anus occurs when cloacal membrane fails to breakdown.
16. Rectoperineal fistula
Traditionally was known as a “low
defect.”
The rectum is located within most
of the sphincter mechanism.
Only the lowest part of the rectum
is anteriorly mislocated .
17. Rectoperineal fistula
Sometimes, the fistula does not open into the perineum but
rather follows a subepithelial midline tract, opening
somewhere along the midline perineal raphe, scrotum, or
even at the base of the penis.
Diagnosis established by perineal inspection
No further investigations required.
18. Rectoperineal fistula
The terms covered anus, anal membrane, anteriorly mislocated anus,
and bucket-handle malformations all refer to perineal fistulas.
19. Rectourethral fistula
Imperforate anus with a rectourethral fistula is most common defect in boys.
The fistula may be located at
o The lower (bulbar) part of the urethra
• Lower urethral fistulas are usually associated with good-quality
muscles, a well-developed sacrum, a prominent midline groove, and a
prominent anal dimple.
o The higher (prostatic) part of the urethra
• Higher urethral fistulas are more frequently associated with poor-quality
muscles, an abnormally developed sacrum, a flat perineum.
20.
21. Recto-bladder neck fistula
Rectum opens into the bladder neck
Levator muscle, muscle complex, and parasagittal fibers are poorly
developed
Sacrum is often deformed or absent
Entire pelvis is underdeveloped
Prognosis for bowel function is poor
22. Recto-bladder neck fistula
The perineum is often flat,
which is evidence of poor
muscle development.
About 10% of males with
anorectal atresia fall into this
category.
23. Imperforate anus without fistula
Have a well-developed sacrum and good muscles and have
a good prognosis in terms of bowel function.
The rectum usually terminates approximately 2 cm from the
perineal skin.
Common in patients with Down syndrome.
24. Rectal atresia
Occur in 1 % of case
Born with normal appearing anal canal
Often discovered during an attempt to take rectal temperature
~2 cm from the anal verge, there is an atretic or stenotic area
The sacrum is normal, the sphincter mechanism is excellent
Prognosis is good.
25. Rectal atresia
These two structures may be
separated by a thin membrane or
by dense fibrous tissue.
26. Rectoperineal fistula
From the therapeutic and prognostic viewpoint, this common defect
is equivalent to the perineal fistula described in the male patient.
The rectum is well positioned within the sphincter mechanism, except
for its lower portion, which is anteriorly located
The rectum and vagina are well separated.
27.
28. Rectovestibular fistula
Rectovestibular fistula is the most common defect in girls and has
an excellent functional prognosis.
The diagnosis is based on clinical examination.
Meticulous examination of neonatal genitalia allows clinician to
observe normal urethral meatus and a normal vagina, with a third
hole in the vestibule which is the recto vestibular fistula
29.
30. Imperforate anus without fistula
This defect in female patients
carries the same therapeutic and
prognostic implications as
described for male patients.
31.
32. Persistent cloaca
A cloaca is defined as a defect in which the rectum, vagina,
and urinary tract meet and fuse, creating a single common
channel.
This group of defects represents the extreme in the
spectrum of complexity of female malformations.
33. Persistent cloaca
The diagnosis of persistent cloaca is a clinical one.
This defect should be suspected in a female born with
imperforate anus and small-looking genitalia.
Careful separation of the labia discloses a single perineal
orifice.
34. Persistent cloaca
The length of the common channel varies from 1 to 7 cm.
This distance has technical and prognostic implications.
1. Short common channel less than 3 cm
2. Long common channel more than 3 cm
36. Examination
Pelvic floor
Absence or presence of anal opening
Position of anus – normal or anteposed
Bulge in perineum on crying or straining
Anal dimple
Anal reflex
Perineal groove
Bucket handle deformity
Meconium or mucus running up the median scrotal raphe
48. Transverse infracoccygeal sonogram shows the distal rectal pouch (R), which
passes through the puborectalis muscle (arrows), indicating low-type imperforate
anus. U = urethra
49. Investigations
CT scan
Mainly required before surgery.
Clearly shows the anatomy of sphincter muscles,
Levator ani, muscle complex.
Delineates the rectal pouch and fistula.
Clearly shows the relationship between intestine
Surrounding muscles.
50. Investigations
MRI
Provides better soft tissue imaging.
No radiation hazard.
Scan is expanded to include pelvis, kidneys and spinal
cord in case of associated anomalies.
Post operatively it clearly shows whether the pulled through
intestine is within Levator ani sling or not
51. Investigations
High pressure distal colostography
Before the definitive repair, distal colostography
is performed.
It is the most valuable and accurate diagnostic study to
define the anatomy of the anorectal malformation.
52. Investigations
High pressure distal colostography
Water-soluble contrast medium is instilled into the distal stoma,
which fills the distal intestine and enables demonstration of the
location of the blind rectum and the precise site of a rectourinary
fistula.
The contrast medium must be injected with considerable
hydrostatic pressure under fluoroscopic control.
53. Investigations
High pressure distal colostography
The use of a Foley catheter is recommended; it is passed through
the distal stoma, the balloon is inflated (2–5 mL), and it is pulled
back as far as possible to occlude the stoma during the injection
of the contrast medium.
This maneuver permits to overcome the muscle tone of the
striated muscle mechanism, fill the rectum, and demonstrate the
urinary fistula when present.
55. Colostomy
Descending colostomy is preferred.
The colostomy is constructed through a left lower quadrant
oblique or transverse incision.
The proximal stoma is exteriorized through the upper and
lateral part of the wound and the mucous fistula is placed
in the medial or lower part of the wound.
56. Colostomy
The colostomy should be made in the mobile portion of
the colon, immediately distal to the descending colon
taking advantage of its retroperitoneal attachments, and
the mucous fistula is made very small to avoid prolapse.
During the opening of the colostomy, the distal intestine
must be irrigated to remove all the meconium, preventing
the formation of a mega-sigmoid.
57.
58. Colostomy
Advantages of descending colostomy
o Mechanical preparation of the distal colon before the definitive
repair is easy due small length of remaining segment.
o Due to shorter distal segment in patient with recto-urethral or
recto-vesical fistula urine is not accumulate in distal segment of
colon.(which leads to development of metabolic acidosis)
o Less chance of development of megarectosigmoid.
o The incidence of prolapse in the proximal limb of descending
colostomies is almost zero.
59. Posterior sagittal anorectoplasty (PSARP)
All anorectal malformations benefit from the use of the
posterior sagittal approach.
The length of the incision depends on the specific
defect.
The patient is placed in the prone position with the
pelvis elevated.
61. Posterior sagittal anorectoplasty (PSARP)
An incision that starts in the lower portion of the
sacrum and extends anteriorly to the anal sphincter.
Recto vestibular and recto perineal fistula requires
smaller incision so, called limited posterior sagittal ano
rectoplasty and minimal posterior sagittal ano
rectoplasty respectively.
62. Repair in Boys
Recto perineal fistula
The repair of these defects consists of a small anoplasty
with minimal mobilization of the rectum, sufficient for it
to be transposed and placed within the limits of the
sphincter.
It is done during the neonatal period without a
colostomy.
63. Repair in Boys
These patients have an excellent prognosis.
If they have significant associated spinal or sacral
problems an alternative approach, a Pott’s transplant
anoplasty, whereby the majority of the perineal
body is preserved, the mobilized fistula is brought
through a separate incision which is confined to the
size of the future neoanal canal.
64. Repair in Boys
Rectourethral fistula
Most important thing in these cases are to put per
urethral catheter.
Toavoid the catheter to be entered in rectum, the
catheter must be intentionally directed anteriorly by the
use of a lacrimal probe inserted in the distal tip of the
catheter to find its correct path.
65. Repair in Boys
Rectobladder neck fistula
As it is very high defect both approach (through perineum
and through abdomen) is needed.
A plasty of the distal dilated portion of the rectum is
necessary in some cases to reach the perineal skin.
It is also called as abdomino perineal pull through
operation.
66. Repair in Boys
Imperforate anus without fistula
About 5 percent of patients have imperforate anus without a fistula.
In both boys and girls, the rectum lies about 2 cm from the perineal
skin.
The rectum must be carefully separated from the urethra because the
two structures have a common wall.
The rest of the repair must be performed as described for the
rectourethral fistula type of defect
67. Repair in Boys
Rectal atresia and stenosis
These defects are repaired through a posterior sagittal
approach.
The entire sphincteric mechanism is divided in the
midline.
The narrowed area of the distal rectum is opened
posteriorly.
68. Repair in Boys
Rectal atresia and stenosis
The posterior rectum is mobilized to reach the anal skin.
No anterior dissection is needed.
The sphincter mechanism posterior to the rectum is
reconstructed.
Any presacral mass is dealt simultaneously in the
same operation.
69. Repair in Girls
Recto perineal fistula
The treatment of rectoperineal fistula in girls is the same
as that discussed for boys, except of course that the
anterior rectal wall is mobilized off the area behind the
vagina.
70. Repair in Girls
Rectovestibular fistula
Incision in this defect is usually shorter as compare to
recto urethral fistula in boys.
Starting from posteriorly sphincter mechanism is
divided till reach rectal fascia which is helpful in
indenting the plane of dissection.
Then we go laterally and then anteriorly using this
plane.
71. Repair in Girls
Rectovestibular fistula
Because the rectum and vagina have single wall it is
divided using needle cautery.
The most common error in performing this operation is
incomplete separation of the vagina and rectum.
This may create a tense anastomosis between the
rectum and the skin, which may provoke dehiscence
and recurrence of the fistula
72. Repair in Girls
Rectovestibular fistula
The anterior limit of the external sphincter is identified
using electrical stimulation and the anterior edge of the
muscle complex are reapproximated as previously
described, creating the perineal body.
73. Repair in Girls
Rectovaginal fistula
Imperforate anus with a true rectovaginal fistula is extremely
rare.
A true rectovaginal fistula requires a full posterior sagittal
incision.
The operation is essentially the same as that described for
a rectovestibular fistula, except that it is necessary to
dissect much more of the rectum to gain enough length to
pull it down to the perineum.
74.
75.
76.
77.
78. PSARP in female
Involves a midline incision from the fistula to the putative
site of the anus.
Division of the muscles in the midline, separation of the
rectum from the vagina under vision
Placement of the rectum within sphincteric complex and
reconstruction of the perineal body.
Indications:
o All low and intermediate type of abnormality in females
o Revision surgery following cutback operations
81. Abdomino perineal pull through
operation
Lower bowel is mobilized
New passage is created through the pelvic floor keeping
close to the urethra
Fistulous tract is divided and ligated
Bowel can be pulled down and its mucosa stitched to the
skin of the newly formed anus.
Daily dilatation will be required for at least 3 months
83. Laparoscopically assisted anorectal pull
through (LAARP) for highARM
Advantages:
LAARP allows the surgeon to treat a high lesion like a low lesion.
No need to divide the muscle complex from below.
Immediately after the procedure strong and symmetric contraction of the
sphincter around the neo anus can be seen.
It also avoids the complication and multiple procedures associated with
colostomy.
More rapid return of bowel function
Improved cosmetic appearance
Shorter postoperative recovery
Decreased postoperative complications
84.
85. Post operative care
In cases of rectourethral fistula in boys, the urethral
catheter is left in place for 7 days.
If the urethral catheter is accidentally dislodged, the patient
can be observed for spontaneous voiding, which usually
occurs.
Attempts to reintroduce a urethral catheter is avoided.
86. Post operative care
Intravenous antibiotics are administered for 24 hours. An antibiotic ointment
is applied to the anoplasty for 5 days.
The patient is discharged after 2 days in cases of a posterior approach without a
laparotomy or laparoscopy, and after 3–5 days in cases of an abdominal
approach.
The parents are instructed to keep the incision clean, not to wipe, and to apply
antibiotic ointment for 1 week.
Two weeks after the operations, anal dilatations are started. On the first
occasion, a dilator that fits loosely into the anus is used to instruct the parents,
who must carry out dilatation twice daily.
87. Post operative care
Every week, the size of the dilator is increased until the rectum
reaches the desired size, which depends on the patient’s age.
Once the desired size is reached, the colostomy can be closed.
Frequency of dilatation should be reduced in following
schedule:
o At least once a day for one month; every third day for one month;
twice a week for one month; once a week for one month; and every
2 weeks for three months.
89. Post operative care
Initially patient may have diaper rash due to multiple bowel
movement which is converted to 2 or 3 bowel movement per
day in 6 months.
Patient with 2 to 3 bowel movement in day, with some feeling
on having bowel movement have good prognosis and
responds to toilet training.
Females Rectovestibular followed by recto perineal
Males : rectourethral followed by rectoperineal
-Excessive pressure on the groin during a posterior sagittal operation can lead to this problem, which can be avoided by adequate cushioning of the patient’s pelvis while in the prone position.
-Neurogenic bladder following a posterior sagittal approach in patients with favorable anatomy can occur due to nerve damage during the rectal dissection.