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Combining all three morphologic risk factors (absence of degenerative atypia, presence of ≥25% oligodendroglial morphology, absence of leptomeningeal invasion) in cerebellar pilocytic astrocytomas. (A) The greatest increase in adverse outcome probability was from two risk factors to three (*P < 0.05 vs. one or two risk factors). (B) The risk of adverse outcome increases with the number of risk factors identified microscopically (P < 0.001).
