What is the best estimate of 5-year actuarial tumor control after single-session radiosurgery for skull base meningioma WHO grade I?
29% 7% 36% 29% The correct answer is 91-95%.
A recent multicenter consortium study reviewed outcomes in 675 cases of posterior fossa meningioma, half of which underwent surgery before radiation, and half of which did not. After treatment to a mean margin dose of 13.6 Gy, at 5 years, tumor control was achieved in 91.2%.