Cerebellar Agenesis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Cerebellar Agenesis?
A neurologist, which is a doctor who treats problems of the brain and nervous system, usually cares for people with cerebellar agenesis. A gastroenterologist, who treats the stomach and intestines, may help with feeding or swallowing problems. Care often involves a team of doctors working together.
What it is
Cerebellar agenesis is a rare condition in which a person is born without a cerebellum, or with only part of one. The cerebellum helps control balance, movement, and coordination. Other parts of the brain often try to take over those jobs, and most people with the condition still have noticeable movement problems.
Symptoms
Symptoms vary from person to person. Common problems include unsteady walking, shaky movements, and slurred speech. Some people also have weak muscles, trouble swallowing, learning delays, or seizures.
Causes and who gets it
Doctors do not always know why the cerebellum fails to form. Possible causes include gene changes and certain exposures during pregnancy. Some cases run in families, while others appear with no family history.
How doctors diagnose it
Doctors often find cerebellar agenesis with an MRI. Sometimes it is spotted before birth on an ultrasound. A doctor will also examine the patient and ask about development and family history, and genetic testing may be suggested.
Treatment
There is no treatment that makes a missing cerebellum grow back. Care focuses on building skills and managing symptoms. Physical therapy helps with balance and walking, speech therapy with talking and swallowing, and occupational therapy with everyday tasks. Medicines may control seizures.
When to see a doctor
A baby or child who is late to sit, crawl, or walk, or who seems very unsteady, should be checked by a doctor. Trouble swallowing, frequent choking, or hard-to-understand speech are also reasons to get care.
What kind of doctor treats it
A neurologist usually leads care. A gastroenterologist may help when swallowing or feeding problems affect nutrition. Physical, speech, and occupational therapists handle much of the day-to-day work, and a primary care doctor can coordinate everything.
A direct primary care doctor, paid a flat monthly fee instead of billing insurance, can spend extra time coordinating team care, as can a concierge doctor. They can order imaging and genetic testing referrals and refer to a neurologist or gastroenterologist when needed, keeping the whole plan organized.
Common questions
Can a person live without a cerebellum?
Yes, a small number of people have been found to live with little or no cerebellum. Their brains found other ways to handle some balance and movement tasks. Most still have some problems with coordination, speech, or learning.
Is cerebellar agenesis the same as cerebellar hypoplasia?
No. Agenesis means the cerebellum did not form at all, or almost not at all. Hypoplasia means the cerebellum formed but is smaller than usual. The two conditions can cause similar symptoms, but they are different.
Can cerebellar agenesis be found before birth?
Sometimes. An ultrasound during pregnancy can show that the cerebellum looks unusual, and an MRI may give more detail. In many cases, though, the condition is not found until after the baby is born.
Will a person with cerebellar agenesis ever walk or talk?
It depends on the person. Some people walk and speak with only mild trouble, while others need a wheelchair or help communicating. Therapies over many years often make a real difference, but results differ from person to person.
Sources
- MedlinePlus - Cerebellar Disorders
- National Institute of Neurological Disorders and Stroke - Cerebellar Degeneration
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.
