Patients between the ages of 4 and 21 who meet the following criteria can participate in this study:
DISEASE CHARACTERISTICS (meets one of the following criteria):
PRIOR CONCURRENT THERAPY:
Patients with Chiari malformation and patients with posterior fossa tumor undergo standard surgery. Patients with posterior fossa tumor also receive standard radiotherapy and chemotherapy.
Blood samples are collected at baseline and periodically to measure the level of circulating T-regulatory cells.
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