Complications of medulloblastoma include:

• Brain herniation:
• Damage to the lower portion of the brain due to increased pressure within the brain
• Loss of communication skills:
• Aphasia
• Permanent neurologic impairment
• The loss of the ability to perform basic self-care
• Coma

Side effects of chemotherapy may include:

• Anorexia
• Bone marrow damage:
• Anemia
• Low platelet count
• Low white blood cell count
• Constipation and diarrhea
• Excessive bruising or bleeding
• Hair loss
• Heart failure
• Increased risk of infection
• Mouth sores:
• Mucositis
• Nausea and vomiting
• Weakness or fatigue
• Weight loss

Complications of radiation therapy may include:

• Fatigue
• Hair loss
• Infertility
• Nausea and vomiting
• Other cancers
• Rashes
• Retarded bone growth in children
• Weight loss