Dandy-Walker Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Dandy-Walker syndrome?
A neurologist (brain and nerve doctor) and a pediatrician (children's doctor) usually share care for Dandy-Walker syndrome, a brain malformation that mostly affects a part of the brain called the cerebellum. It can cause fluid buildup in the brain, developmental delays or coordination problems, so care often involves a team of specialists. Vomiting or a bulging soft spot in a baby can signal hydrocephalus, so call 911.
What is Dandy-Walker syndrome?
This condition affects how the brain grows, mostly the cerebellum. The cerebellum is the part of the brain that coordinates movement.
The middle part of the cerebellum, called the vermis, is missing or very small. The fluid-filled cavity between the brainstem and the cerebellum, called the fourth ventricle, is larger than usual.
It affects an estimated 1 in 10,000 to 30,000 newborns. Most people show signs at birth or in the first year.
Symptoms
Symptoms vary and can include:
- Delayed motor skills, such as crawling, walking, and coordinating movements.
- Hydrocephalus, a buildup of fluid in the brain that may cause a larger head.
- Intellectual disability, which is mild to severe in up to half of people.
- Learning problems, even in some people with normal intelligence.
- Muscle stiffness, partial paralysis of the lower limbs, and seizures.
In babies, high pressure in the head often shows up as a head that keeps growing. Another sign is a bulging soft spot on the head.
Hearing and vision problems are rare. Some people also have heart defects or extra fingers or toes.
In 10 to 20 percent of people, signs start in late childhood or adulthood. These can include headaches and an unsteady walk. Rarely, people have no health problems from the condition.
Causes and who gets it
Researchers have found changes in a few genes linked to this condition. These changes explain only a few cases.
It is also linked to chromosome changes, such as an extra copy of chromosome 18. Often it occurs alone. Then the cause is frequently unknown.
Things that affect development before birth may play a part. A mother with diabetes is more likely to have a child with it.
Most cases happen in people with no family history. Siblings and children of an affected person have a higher risk.
How doctors diagnose it
Doctors can find it before birth, with an ultrasound. If the ultrasound is not clear, doctors may use an MRI scan.
After birth, an ultrasound or MRI can confirm it. MRI is seen as the most accurate imaging test.
Milder cases may not be found until late adolescence.
Treatment
Treatment does not aim to correct the brain difference itself. It focuses on hydrocephalus and the fluid-filled cyst at the back of the skull. The choice depends on how bad the symptoms are.
The most common treatment for hydrocephalus is surgery. A doctor may place a shunt, a tube that drains the extra fluid into the chest or belly so the body can absorb it. Another surgery, called endoscopic third ventriculostomy, helps fluid flow out of the brain. Shunts can stop working or get infected, so they need regular checkups. Rehabilitation therapies also help many people.
Care also includes treating other problems. It includes follow-up with a team of specialists. Outlook depends heavily on whether other problems are present.
When to see a doctor
Hydrocephalus can cause brain damage or even death. Problems from hydrocephalus or its treatment are the most common cause of death.
Call 911 or go to the emergency room if a child has trouble breathing, faints, has a seizure, is very sleepy, or has a sudden change in mental state, such as confusion. Also call 911 or go to the emergency room for a bulging soft spot or repeated vomiting in a baby, or a bad headache with vomiting or sleepiness in an older child. These can be signs of hydrocephalus. If your child has a shunt, they can also mean the shunt is not working.
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. It can affect other body systems. A direct primary care or concierge doctor can help track growth and development and coordinate visits with specialists.
Common questions
What are the symptoms of Dandy-Walker syndrome?
Symptoms of Dandy-Walker syndrome vary but can include a larger than usual head, delayed motor skills, poor coordination and, in some cases, fluid buildup in the brain called hydrocephalus. Some children have mild symptoms while others have more severe ones.
Can a direct primary care doctor manage Dandy-Walker syndrome?
Not by itself. A pediatrician in a direct primary care or concierge practice can monitor a child's growth and development and coordinate closely with a neurologist, who leads brain-related care. Because Dandy-Walker syndrome can affect several body systems, care involves a team of specialists alongside primary care.
Is Dandy-Walker syndrome life-threatening?
It can be. Untreated hydrocephalus can cause brain damage or even death. Problems from hydrocephalus or its treatment are the most common cause of death. Early diagnosis and treatment are important for a better outlook.
Sources
- MedlinePlus Genetics - Dandy-Walker malformation
- National Library of Medicine (PubMed Central) - Dandy-Walker syndrome: an updated literature review
- National Institute of Neurological Disorders and Stroke - Hydrocephalus
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.
