Cloacal exstrophy is one of the rarest and most complex congenital abnormalities a child can be born with, affecting roughly 1 in 200,000 to 400,000 live births. In this condition, the abdominal wall fails to close properly during early fetal development, leaving the bladder split into two halves with a segment of intestine (the cecum) exposed between them, along with an imperforate anus and often an omphalocele. Before the 1980s, it was almost universally fatal; today, survival rates range from about 83 to 100 percent thanks to advances in neonatal intensive care and reconstructive surgery, though the condition still demands a lifetime of specialized medical attention.1Journal of Medical Insight. Cloacal exstrophy repair
What Cloacal Exstrophy Looks Like at Birth
A newborn with cloacal exstrophy presents with a constellation of abnormalities visible immediately at delivery. The bladder is open on the abdominal surface and divided into two halves, with a strip of intestinal tissue (the cecal plate) sitting between them. Unlike the related but less severe condition of bladder exstrophy, cloacal exstrophy is always associated with an imperforate anus, meaning there is no anal opening. The external genitalia are incompletely formed in both genetic males and genetic females. In boys, the phallus is typically small and split; in girls, the clitoris may be split with a bifid uterus and duplicate or exposed vagina.2PubMed. Exstrophy of the cloaca and exstrophy of the bladder: two different expressions of a primary developmental field defect
An omphalocele, where abdominal organs protrude through the navel in a membranous sac, frequently accompanies the condition, along with spinal defects. This cluster of features is sometimes referred to by the acronym OEIS complex, standing for omphalocele, exstrophy, imperforate anus, and spinal defects.3PubMed Central. The OEIS complex (omphalocele-exstrophy-imperforate anus-spinal defects): recurrence in sibs Not every child with cloacal exstrophy has every component, but the overlap is substantial enough that the two terms are often used interchangeably in clinical settings.
What Causes It
The exact cause remains unclear, and no single gene has been identified as responsible. The prevailing theory is that early in embryonic development, the cloacal membrane, a thin partition that normally ruptures in a controlled way to form separate urinary, genital, and intestinal openings, either ruptures prematurely or fails to be properly reinforced by migrating tissue. When that goes wrong, the structures that should have formed behind the membrane are left exposed and malformed.
A large case-control study using data from the National Birth Defects Prevention Study examined risk factors in 47 cloacal exstrophy cases and 54 persistent cloaca cases. Researchers found significant positive associations between cloacal defects and the use of fertility medications or assisted reproductive technology. Crude analyses also suggested possible links with maternal obesity, progesterone use, folate antagonist medications, and X-ray exposure, though these associations did not all hold up after statistical adjustment.4PubMed Central. Clinical and risk factor analysis of cloacal defects in the National Birth Defects Prevention Study The condition has been reported in siblings, which hints at some genetic contribution, but familial recurrence is extremely rare.5PubMed Central. The OEIS complex (omphalocele-exstrophy-imperforate anus-spinal defects): recurrence in sibs
Prenatal Diagnosis
Cloacal exstrophy can sometimes be detected during routine prenatal ultrasound, though distinguishing it from the less severe bladder exstrophy is not straightforward. On ultrasound, a key differentiating feature is where the umbilical cord inserts relative to the abdominal wall defect. Correctly identifying that insertion point with ultrasound or fetal MRI helps clinicians distinguish between the two conditions and avoid misdiagnosis.6PubMed. Key anatomic findings on fetal ultrasound and MRI in the prenatal diagnosis of bladder and cloacal exstrophy
Fetal MRI is especially useful for confirming the diagnosis. In one study of eight fetuses, MRI confirmed cloacal exstrophy in all cases by demonstrating the absence of a normal bladder and the lack of a meconium-filled rectum or colon, along with an omphalocele and a protruding pelvic contour.7PubMed. Fetal MRI of cloacal exstrophy Early diagnosis matters enormously because it allows the delivery to be planned at a center equipped with the pediatric surgical, urological, and neonatal intensive care teams the baby will need immediately.
The First Surgery
The newborn period is when the most urgent decisions get made. The immediate goals are to close the omphalocele, separate the intestinal and urinary components, create some form of intestinal stoma (since the child has no anus), and preserve as much bowel length as possible.8PubMed. Cloacal exstrophy: a comprehensive review of an uncommon problem These priorities sound simple on paper but involve balancing competing surgical demands in a very fragile patient.
The traditional newborn operation involves separating the cecal plate from between the two bladder halves, closing the omphalocele, and effectively converting the anatomy to something resembling a bladder exstrophy, with the bladder closure deferred until later. However, this approach can lead to complications: when the cecal segment is left in the fecal stream, it can cause bacterial overgrowth and high ostomy output, sometimes requiring further surgery. A newer modification leaves the cecal plate untouched between the bladder halves and connects the small bowel directly to the hindgut, which is technically simpler and keeps the cecum isolated from stool flow.9PubMed Central. A Modification of the Newborn Operation for Cloacal Exstrophy: Leaving the Cecal Plate Untouched
One important technical detail from early surgical experience is the emphasis on creating a “tailgutostomy” rather than a standard ileostomy, because retaining the hindgut segment for the stoma helps prevent the diarrhea, dehydration, and metabolic acidosis that result when too much small bowel is diverted.10Journal of Pediatric Surgery. Modern treatment of cloacal exstrophy
Single-Stage Versus Staged Reconstruction
One of the ongoing debates in cloacal exstrophy care is whether to attempt a complete or near-complete repair in one operation or to spread it across several surgeries over months or years. A single-stage approach reduces the total number of times a child goes under general anesthesia and can shorten the overall hospital stay.11PubMed Central. Cloacal Exstrophy Repair with Primary Closure of Bladder Exstrophy: A Case Report and Review of Literature But it carries a real risk of bladder dehiscence, where the closure falls apart, a complication that can lead to sepsis and even death.12Journal of Medical Insight. Cloacal exstrophy repair
The staged approach delays the bladder closure until around 15 to 18 months of age. This gives the infant time to grow, develop more bladder tissue, and build stronger pelvic bones for the osteotomies that help bring the pubic bones together. Recent comparative data from a multidisciplinary center found outcomes of both approaches were comparable, but recommended tailoring the choice to each patient. Single-stage closure was recommended for male neonates, while a staged approach was advised for patients referred later, those with low birth weight, pubic diastasis greater than 5 centimeters, or significant cardiac problems.13PubMed. Cloacal exstrophy management in a low- and middle-income country (LMIC): comparative outcomes of direct versus staged closure and a multidisciplinary risk-stratified protocol
Pelvic Osteotomy and Its Role
Because the pelvis in cloacal exstrophy is widely splayed open, surgeons often perform pelvic osteotomies, where the pelvic bones are deliberately cut and repositioned, to bring the pubic bones close enough together to support the bladder closure. Data show this step makes a meaningful difference: successful closure was achieved in about 78 percent of patients who had an osteotomy compared with roughly 42 percent of those who did not. Combined approaches using both anterior and posterior osteotomies had the highest success rates, around 90 percent.14PubMed. Pelvic osteotomy in cloacal exstrophy: A changing perspective
Long-term follow-up suggests that most patients regain a normal gait and good physical function after osteotomy, with the exception of cases involving superior gluteal nerve injury. Interestingly, exstrophy patients who never had an osteotomy appear to develop higher joint stress levels and more degenerative hip changes over time compared to those who did.15Journal of Medical Insight. Pelvic osteotomies for cloacal exstrophy
Gastrointestinal Challenges
The gut is one of the most vulnerable organ systems in cloacal exstrophy. Because of the intestinal malformations and the surgery required to create a stoma, many infants effectively experience short bowel physiology, where there is not enough functioning intestine to absorb adequate nutrition. In one series, the average time before a baby could start feeding by mouth after the initial surgery was about 16 days, and total parenteral nutrition (intravenous feeding) continued for a median of over a month.16PubMed. Management of the gastrointestinal tract and nutrition in patients with cloacal exstrophy The good news is that most children eventually adapt, with the remaining bowel gradually taking over enough absorptive function to allow weaning off intravenous nutrition.
The type of stoma matters. Children with an ileostomy (made from the small bowel) tend to have higher output losses and need more nutritional supplementation than those whose stoma uses the colon. Patients with duodenal atresia or significant bowel loss face the gravest prognosis; in one series, two neonates with these additional problems died within the first month.17PubMed. Cloacal exstrophy: morbidity associated with abnormalities of the gastrointestinal tract and spine TPN-associated liver failure is the most feared complication of prolonged intravenous feeding in this population, and it underscores why preserving bowel length during the initial surgery is treated as a high priority.
Spinal and Neurological Concerns
This is an area where the evidence suggests clinicians have historically underestimated the problem. In one detailed institutional review, spinal cord or vertebral abnormalities were found in nearly every patient with cloacal exstrophy, approaching 100 percent when full imaging was done. The most common findings were lipomeningocele and lipomyelocystocele, both forms of spinal cord tethering where fat or cysts anchor the spinal cord in place, preventing it from moving freely as the child grows. Of the 17 patients in that series, 11 required spinal surgery to untether the cord, and two of those later needed reoperation when the cord re-tethered.18Journal of Urology. Cloacal Exstrophy: The Neurological Implications
Despite these challenges, 15 of the 17 patients in that series were ambulatory, though five needed lower extremity braces. The takeaway for families is that MRI of the spinal cord should be part of the initial evaluation after birth, and neurological monitoring needs to continue throughout life. Tethered cord can cause progressive loss of leg function, bladder control, and bowel function, but catching it early and releasing the tether surgically can preserve or restore function.
Achieving Urinary Continence
Because the bladder in cloacal exstrophy starts out as two small, malformed halves, most patients need substantial reconstruction before continence is a realistic goal. In a 25-year series of 50 patients, bladder augmentation was performed in 35 using stomach, small bowel, or a combination. To achieve continence, 21 patients had bladder neck narrowing, 12 had a catheterizable channel built onto the abdominal wall (a Mitrofanoff procedure), and four ended up with a permanent urinary diversion.19PubMed. Cloacal exstrophy: a 25-year experience with 50 cases Earlier experience found that stomach tissue was particularly well suited for bladder reconstruction in this population.20PubMed. Cloacal exstrophy reconstruction for urinary continence
Many patients ultimately manage their urinary drainage through clean intermittent catheterization, often using an abdominal channel rather than the urethra. While this is not spontaneous voiding, it gives most people a socially continent life, meaning they stay dry between catheterizations and can participate in school, work, and activities without visible devices. Urinary incontinence nonetheless remains one of the most common long-term issues, with reported prevalence ranging widely from about 9 to 85 percent depending on the series and the definition used.21PubMed. Long-term active problems in patients with cloacal exstrophy: A systematic review
Protecting Kidney Function
With abnormal urinary anatomy and repeated surgical interventions, the kidneys are perpetually at risk. Reflux, obstruction, and recurrent urinary infections can all silently damage the kidneys over years. Encouragingly, data from a strict renal protection protocol followed in over 100 children with cloacal malformations showed that with vigilant monitoring, kidney outcomes can be quite good. Only about 6 percent had renal dysfunction at the most recent follow-up, and fewer than 3 percent progressed from normal kidney function at birth to dysfunction. No child who started with normal kidney function had progressed to needing dialysis or transplantation.22PubMed. Following a strict renal protection protocol in cloacal malformations: A descriptive analysis The lesson is that kidney damage in this condition is largely preventable when surveillance is consistent and problems are caught early.
Gender Identity and the Shift Away from Reassignment
For decades, genetic males born with cloacal exstrophy were routinely reassigned and raised as girls, largely because the phallus was absent or severely underdeveloped and surgical creation of male genitalia was thought to be impossible. This practice was grounded in the then-prevailing theory that gender identity was primarily shaped by upbringing rather than biology. The evidence has thoroughly challenged that assumption.
In a landmark study published in the New England Journal of Medicine, researchers followed 14 genetic males with cloacal exstrophy who had been assigned female at birth. Eight of the 14 declared themselves male during the study period, and six had independently reassigned themselves to male. The two patients who had been raised male from birth remained male. All 16 subjects in the study showed interests and attitudes considered typical of males, regardless of how they had been raised.23PubMed Central. Discordant sexual identity in some genetic males with cloacal exstrophy assigned to female sex at birth
A broader review of cases involving female-raised 46,XY individuals with cloacal exstrophy, penile agenesis, or penile ablation confirmed an increased risk of patient-initiated gender reassignment to male. The findings were not absolute: not every reassigned individual switched back, which researchers noted is incompatible with the idea that prenatal hormones fully determine gender identity. But the rate of dissatisfaction was high enough to fundamentally change practice.24PubMed. Gender identity outcome in female-raised 46,XY persons with penile agenesis, cloacal exstrophy of the bladder, or penile ablation A systematic review found that gender identity issues in 46,XY patients raised female occurred in anywhere from 11 to 67 percent of reported cases.25PubMed. Long-term active problems in patients with cloacal exstrophy: A systematic review
Current guidelines generally favor raising genetic males as male, even when genital reconstruction will be complex and imperfect. The goal of phalloplasty in this context is to create a phallus that allows standing urination and, ideally, eventual sexual function, though outcomes vary and multiple surgeries are typically required.26PubMed Central. Phalloplasty for the genetic male For families navigating this decision, the consensus has shifted toward deferring irreversible genital surgery in infancy when possible, allowing the child to participate in decisions about their own body as they mature.
Adult Life and Reproductive Outcomes
As survival has improved, the population of adults living with cloacal exstrophy has grown, and the emphasis has shifted toward quality of life.27PubMed Central. Updates on the Care of Cloacal Exstrophy For women born with the condition, the picture is cautiously encouraging. In one long-term follow-up, about 76 percent were sexually active, all reporting heterosexual relationships, and 88 percent menstruated regularly. Four pregnancies were reported, all delivered by cesarean section, and the children were healthy.28PubMed. Quality of life for adult women born with bladder and cloacal exstrophy: a long-term follow up
For men, the reproductive outlook is bleaker. No cases of biological paternity have been documented in the literature to date.29PubMed. Long-term active problems in patients with cloacal exstrophy: A systematic review Sexual function issues related to vaginal anomalies in women and phallic insufficiency in men remain among the most common persistent problems across both sexes. Uterine anomalies affect a substantial proportion of women, contributing to the complications seen during pregnancy.
The complexity of the anatomy also means that adults with cloacal exstrophy continue to face medical issues that require specialty care. Kidney stones, abdominal wall complications from catheterizable channels, and revisions to urinary diversions are not uncommon, and they often require a multidisciplinary team of urologists, general surgeons, and nephrologists working together.30PubMed Central. Multidisciplinary management of adult cloacal exstrophy complications: A challenging case of nephrolithiasis and abdominal wall extrusion of a catheterizable ileal pouch Transition from pediatric to adult care is a recognized challenge, because few adult providers have experience with this condition.
The Burden on Families
The medical literature on cloacal exstrophy tends to focus on surgical techniques and anatomical outcomes, but the toll on caregivers is enormous and often underrecognized. A mixed-methods study that surveyed families of children with bladder exstrophy over multiple years found that community stigma was a major source of distress, with about a quarter of caregivers identifying their own village or community as the primary source. Over half reported long-term anxieties about their child’s future fertility and marriage prospects.31PubMed Central. Caregiver distress: A mixed methods evaluation of the mental health burden of caring for children with bladder exstrophy
Perhaps most striking, caregiver emotional wellbeing declined as the number of subsequent surgical repairs increased. Three-quarters of caregivers in one cohort reported decreased emotional wellbeing with additional surgeries, and those whose children had initial surgery within five years of screening reported higher anxiety, compounded by each subsequent procedure. These findings argue for building psychological support into the care model from the beginning, not as an afterthought once a family is already struggling. For a condition that can involve a dozen or more operations over a lifetime, the cumulative psychological weight on parents and children alike is a medical issue in its own right.