Caudal Regression Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Caudal Regression Syndrome?
Children with caudal regression syndrome, a rare condition that affects the lower spine and nearby organs, usually see a team that includes an orthopedic surgeon (bone doctor), a urologist (urinary tract doctor), and a neurosurgeon (brain and spine surgeon). A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is Caudal Regression Syndrome?
Caudal regression syndrome is a disorder that affects the development of the lower part of the spine. The word caudal means the lower end of the body. In this condition, the bones of the lower spine, called vertebrae, are misshapen or missing. The end of the spinal cord, the bundle of nerves protected by those bones, may also be malformed or missing. Sometimes the spinal cord is abnormally attached to nearby tissue.
The condition can affect many parts of the lower body, including the lower back and legs, the urinary and genital tract, and the gut. How severe it is varies a lot from one child to another.
Symptoms
Signs depend on which bones and organs are affected. They can include:
- Misshapen or missing lower spine bones. An abnormal spine curve called lordosis or kyphosis.
- Small hip bones. Flat and dimpled buttocks. Leg bones that are underdeveloped.
- Stiff joints in the lower legs. Clubfeet. Legs held in unusual positions.
- Reduced or excessive feeling in the legs. This differs from person to person.
- Trouble controlling urine (neurogenic bladder). Bowel control trouble and constipation are common too.
- Malformed kidneys. These can lead to repeat urinary infections and kidney damage.
- Genital differences. The urethra may open on the underside of the penis. Testes may not descend.
Some children also have gut problems, such as a blocked anal opening or a twisted intestine. A few have a heart condition or hearing problems. Very rarely, the chest shape causes breathing trouble. Some children walk on their own. Others need braces, crutches, walkers, or wheelchairs.
Causes and who gets it
The exact cause is unknown. Researchers believe several genetic and environmental factors act together. One known risk factor is diabetes in the mother during pregnancy. High blood sugar may harm the developing baby. The risk rises more if the diabetes is poorly managed. An estimated 1 to 2.5 in 100,000 newborns have the condition, but the chance is much higher, about 1 in 350, among babies whose parent has diabetes while pregnant. The condition usually occurs sporadically, meaning there is no family history of it. Alcohol or cocaine exposure during pregnancy has also been linked in some cases.
How doctors diagnose it
Doctors can spot signs before birth on an ultrasound. That scan uses sound waves to make pictures of the baby. After birth, doctors use a physical exam plus imaging. X-rays can show the missing or misshapen spine bones. MRI scans use magnets and radio waves. They show the spinal cord and the sacrum, the bone at the base of the spine, in detail. Heart ultrasound and other tests check the organs.
Treatment
Care depends on each child's specific problems. Many children need a team of specialists and staged surgery. Surgery can address some of these problems, such as a blocked anal opening or foot deformities. Physical therapy helps with movement. Braces, crutches, walkers, or wheelchairs can help too. Doctors also watch kidney and bladder health over time.
When to see a doctor
A newborn with a missing or underdeveloped sacrum, unusual leg positions, or a blocked anal opening can have this condition. Kidney problems can lead to repeat urinary infections and reflux of urine into the kidneys, which damage the kidneys and can cause progressive kidney failure.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. With a condition like this, that kind of doctor can follow the child over the years. They can coordinate the many specialists. They can also help manage long-term care, such as bladder and bowel routines.
Common questions
Is Caudal Regression Syndrome inherited?
Usually not. It occurs sporadically. That means it happens in people with no family history of it. Several genetic and environmental factors likely affect the risk.
Can it be prevented?
It depends. Researchers are still trying to identify all the factors that contribute to it. The risks to the baby are higher if diabetes during pregnancy is poorly managed. Alcohol or cocaine exposure during pregnancy has also been linked in some cases.
Will my child be able to walk?
It depends on how severe the condition is. Some children walk on their own. Others need braces, crutches, walkers, or wheelchairs. A rehabilitation team can help your child gain as much mobility as possible.
How common is it among babies of mothers with diabetes?
It is much more common in this group. About 1 in 350 newborns whose parent has diabetes while pregnant are affected, compared with an estimated 1 to 2.5 in 100,000 newborns overall.
Sources
- MedlinePlus Genetics - Caudal regression syndrome
- NCBI PMC - Kylat and Bader, Caudal Regression Syndrome (Children, 2020)
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
