Microsurgical treatment of large and giant parasagittal meningioma invading the superior sagittal sinus

Abstract

Objective To investigate the method and effect of microsurgical removal of large and giant parasagittal meningioma invading the superior sagittal sinus. Methods The clinical data of 154 cases with large and giant parasagittal meningioma invading the superior sagittal sinus admitted to Department of Neurosurgery, Peking University Third Hospital from May 2009 to May 2019 were retrospectively analyzed. The diameter of the tumors ranged from 4 cm to 8 cm, with an average of 5.5±1.2 cm. Microsurgical resection was carried out along the midline and longitudinal fissure with a horse-shoe shaped skin incision turning to the temporal side. The degree of resection was evaluated by Simpson grading system. The results of clinical follow-up were evaluated by Karnofsky performance score (KPS), and the tumor recurrence was evaluated by imaging follow-up. Results Among the 154 cases, Simpson grade Ⅰ resection was achieved in 112 (72.7%) and grade Ⅱ resection in 42 cases (27.3%). All of them were proved to be meningiomas (World Health Organization grade Ⅰ). The operation time ranged from 30 minutes to 210 minutes (median: 60 minutes), and the length of stay ranged from 5 days to 10 days with an average of 7.2±1.1 days. There was no infection, cerebrospinal fluid leakage, death or permanent aggravation of neurological dysfunction. The patients were followed up for 3 months to 123 months, with an average of 63.5±0.7 months. The KPS score ranged from 80 points to 100 points, with an average of 93.6±0.3 points. Tumor recurrence occurred in 14 patients (9.1%), including 7 in Simpson Ⅰ resection group and 7 in Simpson Ⅱ resection group. There was significant difference in recurrence rate between the 2 groups (χ2=4.01, P<0.05). Conclusion Simpson grade Ⅰ microsurgical resection can be pursued for large and giant parasagittal meningioma invading the superior sagittal sinus which helps minimize the recurrence rate. Key words: Meningioma; Microsurgery; Treatment outcome; Sagittal sinus; Large and giant