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Table 1 Simpson grading for Meningioma

From: Treatment of patients with atypical meningiomas Simpson grade 4 and 5 with a carbon ion boost in combination with postoperative photon radiotherapy: The MARCIE Trial

Radical
Stage 1 complete excision, including dura and bone
Stage 2 complete excision + supposed reliable coagulation of dural attachment.
Non-radical
Stage 3 complete excision but insufficient dural coagulation or bone excision (non visible on MR, according to surgeon's opinion)
Stage 4 incomplete excision, macroscopic rest visible (on MRI)
Stage 5 biopsy only (visible on MRI)