Bladder exstrophy is a rare birth defect where the bladder forms inside out and sits exposed on the outside of the abdomen. It occurs in roughly 1 in 40,000 births. The condition is present at birth, visible immediately, and requires surgical correction, but with modern treatment most children go on to live full, active lives.
What Happens During Development
Bladder exstrophy originates early in pregnancy, during the first weeks of embryonic development. Normally, layers of tissue migrate toward the midline of the developing body, fusing together to form the abdominal wall and allowing the bladder and other pelvic organs to settle inside the body cavity. In bladder exstrophy, the structure that anchors the embryo (the body stalk) stays positioned too far back, physically blocking that tissue from reaching the midline.
This creates a wedge effect. The abdominal wall structures get pushed apart laterally, and a thin membrane covering the developing bladder and intestinal area remains exposed. When that membrane eventually ruptures, as it normally would, the bladder is left open on the surface of the abdomen rather than sealed inside. The timing and extent of the rupture determine whether the result is a classic bladder exstrophy or one of several related variants along what doctors call the exstrophy-epispadias complex.
What It Looks Like at Birth
The most obvious feature is the bladder plate itself, a reddish, moist area of exposed bladder tissue on the lower abdomen. Urine visibly drips from the openings of the ureters on the bladder surface. The umbilicus sits lower than usual, and small hernias near the belly button and in the groin are common in both sexes. Beneath the surface, the pubic bones are separated rather than joined at the midline, which gives the pelvis a wider, more open shape.
The genitals are also affected. In boys, the urethra is open along the top of the penis rather than enclosed in a tube, a related condition called epispadias. The penis appears shorter than typical and curves upward. In girls, the clitoris is split into two halves, the vaginal opening is narrower and positioned more toward the front, and the distance between the vaginal opening and the anus is shorter than usual.
How It’s Diagnosed
Bladder exstrophy can sometimes be detected before birth on a routine prenatal ultrasound. The key signs include a bladder that never appears to fill or empty normally, a low-set umbilical cord insertion, separated pubic bones, and genitals that appear smaller than expected. These findings together raise strong suspicion, though the diagnosis is confirmed at delivery when the exposed bladder is visible. In cases where prenatal imaging is inconclusive, the condition is immediately apparent once the baby is born.
Surgical Repair: Staged vs. Single-Stage
Surgery is the cornerstone of treatment, and the goals are consistent regardless of technique: close the bladder and abdominal wall, reconstruct the genitals and urethra, and create conditions that will eventually allow urinary continence. Two main surgical strategies are used at specialized centers today.
The modern staged repair breaks the process into three separate operations spread over several years. The first surgery closes the bladder and abdominal wall, ideally within the first days or weeks of life. A second surgery repairs the epispadias (the open urethra), and a third reconstructs the bladder neck to improve the child’s ability to hold urine. Each stage builds on the last, giving tissues time to grow and heal between procedures.
The complete primary repair aims to accomplish all of these goals in a single operation, typically performed when the baby is 6 to 8 weeks old. This approach consolidates the surgical burden into one event, though it is a longer, more complex procedure. Both strategies produce meaningful results, and the choice between them often depends on the surgical team’s expertise and the child’s specific anatomy.
The Role of Pelvic Bone Surgery
Because the pubic bones are widely separated, surgeons often need to perform a pelvic osteotomy, a procedure where the hip bones are carefully cut and repositioned to bring them closer together. This reduces tension on the abdominal wall closure and allows the muscles to sit in a more natural position. Orthopedic surgeons typically perform this alongside the urologic team. In newborns, the pelvis is flexible enough that osteotomy may not always be necessary, but it becomes increasingly important if the initial closure is delayed beyond the first few days of life.
Continence After Surgery
Achieving urinary continence, the ability to stay dry for meaningful stretches, is one of the most challenging long-term goals. Success rates vary widely depending on the surgical technique, how continence is defined, and how long patients are followed.
Studies of the staged approach report that 23% to 50% of patients achieve continence, with a significant portion needing additional bladder augmentation surgery to increase bladder capacity. Results from the complete primary repair range from 37% to 75%, though these numbers come from smaller studies with different definitions of “continent.” A third technique, radical soft tissue mobilization, shows similar variability, with 36% to 70% of patients reaching at least partial continence.
These numbers reflect the reality that many children need additional procedures beyond the initial repair. Some require catheterization to empty the bladder. Others need surgery to enlarge the bladder using a piece of intestinal tissue. The path to dryness is often measured in years and multiple interventions, but steady improvements in surgical technique continue to push outcomes in a positive direction.
Fertility and Sexual Health
Reproductive outcomes differ significantly between males and females born with bladder exstrophy. Most females have normal fertility. Hundreds of successful pregnancies have been reported in the medical literature, with the first documented case dating back to 1724. Women who have had exstrophy repair are generally advised to deliver by cesarean section to protect the reconstructed urinary tract. Early bed rest during the second trimester may also be recommended to reduce the risk of premature labor.
Males face more significant fertility challenges. Average fertility rates are around 15%, driven by several overlapping factors. Reconstructive surgeries can damage the vas deferens, the tube that carries sperm. Roughly half of male patients experience retrograde ejaculation, where semen travels backward into the bladder instead of exiting the body. Recurrent infections of the epididymis affect about a third of patients. Normal sperm counts have been reported in only 16% to 63% of men with exstrophy, and the rate of producing no sperm at all ranges from 50% to 75% in some studies. Assisted reproductive technologies can help, but fertility is an important topic for families to discuss with their care team early on.
Living With Bladder Exstrophy
Children born with bladder exstrophy today benefit from decades of surgical refinement and multidisciplinary care that simply didn’t exist a generation ago. Treatment is best managed at specialized centers with experience in the condition, since outcomes are closely tied to surgical expertise. Most children attend school, participate in sports, and lead lives that look much like those of their peers, though they typically require ongoing urologic follow-up through adolescence and into adulthood. The physical differences, particularly the wider pelvis and reconstructed genitalia, may influence body image, and psychological support can be a valuable part of long-term care.