Expected headings
"Prognosis"
"Although this is generally true, with the advent of routine post-operative MRI, molecular classifications of meningiomas, and improvements in surgical techniques, the validity and usefulness of the Simpson grade have been debated 2,8,9. Several studies found no difference in recurrence in Simpson grade I-III resections, and there also appears to be variability in recurrence within Simpson grade IV resections 3,4."
"Several other grading systems have been proposed, including the MEGA (Meningioma Group Amsterdam Grading System of Meningioma Removal Based on Postoperative Magnetic Resonance Imaging) scale and the Okudesa-Kobayashi grade; however, these have not been widely validated 6,7."
"It is important to note that as routine imaging was not available at the time of publication the recurrence rate was acatually for "symptomatic recurrence" 1. Subequet publications have shown a similar trend when using imaging to denote recurrence with differences attributatble to length of followup and proportion of WHO grade 1, 2 or 3 meningiomas in the cohort 8."