Recurrence rates by Simpson Grading System for Removal of Meningiomas

provide a short, 2-word definition of the Simpson grades. Definitions according to Greenberg's Handbook of Neurosurgery 10th edition

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Last updated: June 24, 2025

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Grade	Answer	Definition
1	9	Complete removal with excision of dural attachment and abnormal bone (includingsinusresectionwheninvolved)
2	19	macroscopically complete with endothermy coagulation (electrocauteryor laser) of dural attachment
3	29	macroscopically complete without resection or coagulation of dural attachment or of its extradural extensions (e.g.,hyperostoticbone)
4	44	partial removal leaving tumor insitu
5	n/a	simplede compression (±biopsy)