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Fenestrated oculomotor nerve caused by meningioma around the cavernous sinus: a surgical pitfall in tumor removal: case report.

OBJECTIVE AND IMPORTANCE
The preservation of oculomotor nerves is one of the most significant issues regarding the resection of meningiomas around the cavernous sinus.


CLINICAL PRESENTATION
We report the case of a patient whose oculomotor nerve was fenestrated, caused by a large meningioma around the cavernous sinus. The nerve function remained intact until surgery.


INTERVENTION
During surgery, one trunk of the fenestrated nerve behind the tumor was sacrificed. The fenestrated shape of the nerve led us to the misjudgment that the preserved other trunk located along the upper margin of the tumor was the whole nerve.


CONCLUSION
Although fenestrated oculomotor nerves may be rare, their possibility should be kept in mind during surgery around the cavernous sinus.