Bladder exstrophy begins during the earliest stages of fetal development when several structures of the lower abdomen and urinary system are forming.
During early pregnancy, the baby’s abdominal wall, bladder, and pelvic bones develop from tissues that fold and close together as the fetus grows.
In babies with bladder exstrophy, this closure does not occur completely. As a result:
Because these structures develop at the same time during pregnancy, the condition can affect several areas of the body.
Bladder exstrophy is part of a group of conditions known as the exstrophy–epispadias complex (EEC), which involves differences in the urinary tract and pelvic structures.
Researchers have proposed several theories about how bladder exstrophy develops during fetal growth.
One common theory suggests that the condition occurs when a temporary membrane that normally supports the developing bladder ruptures too early during development. When this happens, the bladder and surrounding structures may not form normally within the abdomen.
Other theories focus on differences in how tissues develop and close during early pregnancy. While these explanations help doctors understand the anatomy of the condition, research is still ongoing to determine the exact developmental mechanisms involved.
Bladder exstrophy is a rare condition, and in most cases it occurs without any identifiable risk factors. However, researchers have studied possible genetic and familial patterns.
Most cases of bladder exstrophy occur sporadically, meaning they develop without a clear inherited cause.
While genetic factors may play a role in some cases, bladder exstrophy is not typically passed directly from parent to child in a predictable inheritance pattern.
Researchers continue to study genetic influences that may contribute to the condition.
Families who have one child with bladder exstrophy may have a slightly higher chance of having another child with the condition compared with the general population.
However, the overall recurrence risk remains very low, and most families who have one child with bladder exstrophy do not have additional children affected by the condition.
Genetic counseling may sometimes be recommended for families who want to better understand potential risks in future pregnancies.
Currently, there is no strong evidence that specific environmental exposures cause bladder exstrophy. Researchers have explored whether factors such as medications, environmental exposures, or maternal health conditions during pregnancy might contribute to the development of the condition. However, no single environmental cause has been clearly identified.
Because bladder exstrophy develops very early during fetal growth, many experts believe that a combination of developmental factors may influence how the urinary system and abdominal wall form. Importantly, parents should know that nothing they did during pregnancy caused bladder exstrophy.
At this time, bladder exstrophy cannot be prevented. The condition develops very early during pregnancy while the baby’s organs and body structures are forming.
Because the exact cause is not fully understood and most cases occur randomly, there are no known steps that can guarantee prevention.
Early prenatal care and routine ultrasound imaging may help doctors identify the condition before birth in some cases. When bladder exstrophy is diagnosed during pregnancy, healthcare providers can help families prepare for delivery and specialized medical care after birth.
