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Simpson grade for surgical resection of meningiomas.
| Simpson Grade | Definition (extent of resection) |
|---|---|
| Grade I | Complete removal including resection of underlying bone and associated dura |
| Grade II | Complete removal and coagulation of dural attachment |
| Grade III | Complete removal without resection of dura or coagulation |
| Grade IV | Subtotal resection |
| Grade V | Simple decompression with or without biopsy |
