After the childhood brain stem glioma has been removed, tests are done to find out if there is tumor remaining. The extent or spread of cancer is usually described as stages. For childhood brain stem glioma, the tumors are described by type:

• Diffuse intrinsic pontine glioma is a tumor that has spread widely throughout the brain stem.
• Focal or low-grade glioma is a tumor that is localized to one area of the brain stem.

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