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Medulloblastoma is a tumor that grows in a part of the brain called the cerebellum. The cerebellum is located at the base of the skull, above the brainstem. It is the part of the brain that controls balance, coordination, and other motor functions.

Medulloblastoma is the most common cancerous brain tumor in children. It makes up 20 percent of all pediatric brain tumors. There are between 250 to 500 cases of medulloblastoma found each year in the United States. The tumor is mostly found in children between the ages of 5 and 16, but can occur in older teenagers and even in adults.

Many children can be cured of medulloblastoma with the right treatment. Doctors used to classify medulloblastoma as standard or high-risk, based on factors such as how much of the tumor could be removed surgically, what the tumor looked like under the microscope, and how much the tumor had spread.

However, in recent years, it was discovered that there are actually four different types of medulloblastoma, based on genetic changes within the tumor.


Doctors don’t know what causes most cases of medulloblastoma. There is some evidence that certain rare genetic conditions may increase the risk of developing medulloblastoma, but in general doctors have found no specific cause for the disease.

Signs and Symptoms

The most common symptoms of medulloblastoma are headaches and vomiting, or problems with balance and walking.


Steps in diagnosing medulloblastoma tumors may include taking detailed pictures of the brain and spine with a CT and MRI scan. This is because the tumor can sometimes grow into the spine as well. When the scans confirm a tumor is present, doctors will remove as much of the tumor as possible with surgery. A lumbar puncture (a needle is inserted into the spine to draw fluid for testing) is also done to look for tumor cells in the spinal fluid. A pathologist, a specialist who examines the tumor tissue under the microscope, and genetically-defined methylation analysis determines the tumor’s type and level of risk.


Treatment for medulloblastoma is based on the following:

  • A child’s age
  • The type of tumor
  • Whether the tumor has spread
  • What doctors can tell about how the tumor will behave

Now that we know there are four distinct subtypes of medulloblastoma, doctors believe this will lead to treatments that can be designed for each type of tumor, with fewer side effects, and better chances of cure.

Currently, the first step in treatment is to surgically remove as much of the tumor as possible, followed by radiation therapy to the brain and spinal cord, then chemotherapy.

When patients are younger than 3, doctors try to avoid radiation because it can affect a child’s long-term development. Children of this age will begin chemotherapy after surgery, and may receive radiation treatment when they are older.

For children old enough to receive radiation therapy, Cincinnati Children’s is one of only a few pediatric centers in the nation that offers proton beam radiotherapy. This is a highly precise type of radiation that goes to the tumor and spares damage to nearby tissues and organs as much as possible. Chemotherapy follows the radiation treatment.

We also participate in treatment studies that may be helpful; our treatment team will help guide you in deciding what is best for your child.

Our Treatment Team

Whether a child, teenager or young adult, patients who come to us with medulloblastoma have access to a wide-ranging team of cancer care experts. At the core of the treatment team is a neuro-oncologist, a doctor with expertise in treating medulloblastoma. Many of our brain tumor specialists are also researchers, so each patient has access, when appropriate, to trials of the most advanced treatments.


Our physicians and scientists are always searching for better ways to treat children with medulloblastoma. Many patients can be cured, but cure often depends on the tumor’s type and whether it has spread. Although treatments can be effective, nearly all patients can experience long-term side effects. These may include problems with learning, hearing, hormones and growth, and fertility.

For some patients, secondary cancers can develop later in life. We have a range of specialists who can help your child and your family with life during and after treatment. Our specialists include psychologists, social workers, nutritionists and specialists who work to make sure your child does well in school.

Promising Research and Findings

Cincinnati Children’s is one of the nation’s leading pediatric centers for brain tumor treatment and research. We are actively working on finding the most effective treatments and ultimately the cure for medulloblastoma. Getting scientific discoveries safely and quickly from the laboratory to your child is a major focus of our program.

Last Updated 04/2019

Who treats this.

Children and young adults with tumors of the brain and spine receive advanced, comprehensive care at the Brain Tumor Center.

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Cincinnati Children's offers cancer research studies for patients who are: 

> Children

> Young adults