An evaluation of medulloblastoma will begin with a history and physical examination.

Physical findings may be present that help to localize a tumor within the brain.

Physical findings may include:

• Weakness on one side of the body:
• Arm weakness (unilateral)
• Leg weakness (unilateral)
• Arm and leg weakness (unilateral)
• Numbness on one side of the body:
• Arm numbness (unilateral)
• Leg numbness (unilateral)
• Arm and leg numbness (unilateral)
• Difficulty swallowing
• Difficulty walking
• Difficulty with balance
• Difficulty speaking
• Facial weakness:
• Facial drooping
• Loss of coordination
• Memory loss
• Confusion
• Vision changes:
• Double vision

Tests are necessary to detect the presence, severity and type of brain tumor.

Tests may include:

• Head CT scan:
• Often the first test used to detect a brain tumor
• Brain MRI scan:
• Provides the most detailed views of the brain
• Brain biopsy:
• A sample of tissue is taken from the brain