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The methylation-based classification (2017) and associations with WHO grade.
| Epigenetic groups | Methylation class | Subgroups | WHO grade |
| Group A | Benign | MC ben-1 | Fibroblastic, Transitional, Atypical |
| MC ben-2 | Secretory, Transitional, Meningothelial | ||
| MC ben-3 | Angiomatous, Transitional, Atypical | ||
| Intermediate | MC int-A | Fibroblastic, Transitional, Atypical | |
| Group B | MC int-B | Atypical, Anaplastic | |
| Malignant | MC mal | Anaplastic |
