Simpson Grading System
Simpson Grading System for removal of meningiomas.
|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.|
Donald Simpson THE RECURRENCE OF INTRACRANIAL MENINGIOMAS AFTER SURGICAL TREATMENT J Neurol Neurosurg Psychiatry 1957; 20: 22-39.