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Simpson grades of meningioma resection.
| Extent of Resection | Simpson Grade | Description |
|---|---|---|
| Gross Total Resection (GTR) |
Grade 1 | Gross total resection of tumor, dural attachment, and involved bone (extradural extension) |
| Grade 2 | Gross total resection of tumor, coagulation of dural attachment | |
| Grade 3 | Gross total resection of tumor without resection of coagulation of dural and extradural components | |
| Subtotal Resection (STR) |
Grade 4 | Partial (subtotal) resection of tumor |
| -- | Grade 5 | Biopsy only |
