Troubles visuels aigus associés aux méningiomes sphénoïdaux

Abstract

Meningiomas represent about 20% of intracranial tumors. Involvement of the medial sphenoid wing includes anterior clinoid, cavernous sinus and superior orbital fissure meningiomas. Due to the proximity of these tumors to the optic nerve, typically progressive unilateral vision loss, over several months to years, is the classic clinical presentation. We report three cases of acute monocular vision loss, two transient and one permanent, ipsilateral to a sphenoid meningioma. Ophthalmological involvement with sphenoid meningiomas is most often chronic, due to interruption of axoplasmic flow and demyelination of the optic nerve by local compression. However, vascular involvement with ischemia of the optic nerve or transient low blood flow secondary to compression of the carotid branches vascularizing these structures is another possible mechanism. In our series, two patients had amaurosis fugax, and one patient had sudden, persistent visual loss in relation to acute anterior ischemic optic neuropathy on the side of the meningioma. The mean age of patients with acute visual manifestations was 62 years. These ischemic and non-compressive visual symptoms, ipsilateral to sphenoid meningiomas, are difficult to interpret. Whether these temporary visual disturbances of vascular origin should be considered an early sign of future severe or permanent visual impairment when no optic nerve compression is observed is not certain. The place of these acute visual disturbances in the therapeutic decision, particularly surgical, remains to be defined. Larger multicentric prospective studies are needed to better understand the role of local circulatory factors attributable to meningioma in the occurrence of these acute visual signs.