Background/objective: Visual impairment affects 55%-80% of medial sphenoid wing meningiomas (mSWMs) patients, making optic nerve decompression a critical surgical goal. Complete resection often leads to better visual outcomes. However, involvement of critical neurovascular structures increases postoperative morbidity and mortality, with vascular injury reported in 18%-20% of cases. This study aims to evaluate the relationship between the extent of resection (EOR), visual outcomes, and the incidence of vascular injury, seeking to identify the optimal surgical approach for mSWMs.

Methods: We retrospectively analyzed data from patients undergoing surgery for mSWM at our tertiary care center from January 2001 to December 2021. Inclusion criteria included histopathologically confirmed globoid mSWMs (N = 89). Patients with recurrent tumors (n = 14) or lost to follow-up (n = 9) were excluded. We classified patients into 2 groups based on EOR using Simpson's grade: Group 1 (good-resection,Simpson Grade-I/II,n = 51) and Group 2 (poor-resection,Simpson Grade III/IV, n = 15).

Results: Among 66 (=N) patients, visual impairment was the most common symptom (81.8%), followed by headaches (77.3%) and seizures (27%). T2-hyperintensity on magnetic resonance imaging [(OR:5.4, 95%CI:1.5-18.6) (P-value<0.01)] and cavernous sinus-extension [(OR:3.9, 95%CI:1.1-13.1) (p-value-0.02)] were independent significant predictors of poor resection. Visual status was preserved in 90.3% of Group-1 and 86.6% of Group-2, with no significant difference based on EOR. Vascular involvement was noted in 87.9%, higher than the vessel encasement (>180) (57.6%, P = 0.04). Vessel injury occurred in 7.8% of Group-1 and 6.6% of Group-2, with no significant impact on EOR.

Conclusions: Cavernous sinus-extension and T2-hyperintensity predict poor resection rates in mSWMs. While visual outcomes are not directly affected by EOR, long-term visual status may decline due to tumor recurrence and radiotherapy. Vascular injury incidence is not associated with EOR. Thus, the "maximal safe resection" of mSWMs involves a surgical strategy balancing targeted aggressive and conservative resection for maximal cytoreduction and functional preservation.

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