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Table 1 Simpson Grading System

From: Long-term follow-up of motor function deterioration following microsurgical resection of middle third parasagittal and falx meningioma

Grade Definition of corresponding resection
I Macroscopically complete resection with excision of dural attachment and abnormal bone
II Macroscopically complete resection with coagulation of dural attachment
III Macroscopically complete resection without resection or coagulation of its attachment
IV Subtotal resection
V Simple decompression of the tumor