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Simpson Grading System Simpson Grading System for removal of meningeomas. |
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| I | Macroscopically complete removal of tumour, with excision of its dural attachment, and of any abnormal bone. Includes resection of venous sinus if involved. | |
| II | Macroscopically complete removal of tumour and its visible extensions with coagulation of its dural attachment. | |
| III | Macroscopically complete removal of the intradural tumour, without resection or coagulation of its dural attachment or its extradural extensions. | |
| IV | Partial removal, leaving intradural tumour in situ. | |
| V | Simple decompression, with or without biopsy. | |
Reference
Donald Simpson THE RECURRENCE OF INTRACRANIAL MENINGIOMAS AFTER SURGICAL TREATMENT J Neurol Neurosurg Psychiatry 1957; 20: 22-39.
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