Understanding the Late Effects of Surviving a Pediatric Brain Tumor

The goal of this study is to learn about the cognitive and behavioral functioning of children being treated for cancer.

Inclusion Criteria: Children Treated for Posterior Fossa Tumors: * As per medical record or clinical report, successfully completed all medical treatment for either an M0 posterior fossa medulloblastoma without dissemination or posterior fossa low-grade astrocytoma without relapse or evidence of residual disease. * For medulloblastoma survivors only: Previously treated with gross total resection (GTR), craniospinal irradiation with conformal posterior fossa boost radiotherapy (CSI + Boost) and chemotherapy * For low grade astrocytoma survivors only: Previously treated with gross total resection ONLY (no chemotherapy or radiotherapy). * As per medical record or clinician report, between 1-10 years post completion of their medical treatment for their posterior fossa brain tumor. * Subject is between the ages of 6 through 16 years at time of consent. * As per medical record or parent report, subject is able to tolerate an MRI without sedation. Healthy Control Participants: * No major medical illness, as determined by medical interview by study physician. * As per parent report, subject is between the ages of 6 through 16 years at time of consent. * As per parent report, subject is able to tolerate an MRI without sedation. Exclusion Criteria: All Participants: * Full Scale IQ as documented to be below a standard score of \