What is medulloblastoma?

Medulloblastoma is a type of brain cancer that begins in the lower back part of the brain called the cerebellum. This area helps control balance, coordination, and movement.

It is most often diagnosed in children, though it can occur in adults. These tumors tend to grow quickly and may spread through the fluid surrounding the brain and spinal cord.

In many cases, the exact cause is unknown. A small number of people may be at higher risk due to inherited genetic conditions, but most cases occur without a clear cause.

Symptoms

Medulloblastoma symptoms often develop as the tumor grows and increases pressure inside the skull. Because of its location, it can also affect balance and coordination early on.

Common symptoms include:

• Frequent headaches, especially in the morning
• Nausea or vomiting
• Trouble with balance or walking
• Dizziness
• Vision changes, including double vision
• Fatigue or low energy
• Changes in behavior or thinking
• Hearing problems

How is it diagnosed?

Your provider will begin with a detailed health history and a neurological exam to check balance, coordination, and reflexes.

Imaging tests, especially an MRI of the brain and spine, are the main way to look for a tumor. If a tumor is found, a biopsy or surgery is used to confirm the diagnosis.

Additional testing, such as a spinal tap, may be done to see if cancer cells have spread into the surrounding fluid.

How is it treated?

Treatment usually begins with surgery to remove as much of the tumor as safely possible. This helps relieve pressure and provides tissue for diagnosis.

After surgery, additional treatments are often needed:

• Radiation therapy to target remaining cancer cells
• Chemotherapy to help stop tumor growth or spread

If pressure builds up in the brain, a small tube (shunt) may be placed to drain excess fluid.

Recovery and outcomes vary depending on the tumor type and whether it has spread. Many patients respond well to treatment, but ongoing follow-up with imaging is important to monitor for recurrence or long-term effects.