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Are there different kinds of Retinoblastoma

Basically retinoblastoma is a single condition caused by a mutation in a chromosome. Some patients get it in both eyes and these patients are at risk for spread of the cancer to other sites in the body, and at risk for a certain brain tumor and other tumors. Those who have retinoblastoma in one eye have minimal risk for other tumors but are still at risk for spread of the tumor.