Clinoidal meningiomas are benign tumors arising from arachnoid cap cells located on the anterior clinoid process. Patients commonly present with monocular visual deterioration, which is often unrecognized by patients until visual loss is severe and the tumor has reached a significant size due to proximity of the optic nerve. Complete resection is challenging, especially when their size becomes large enough to encircle, compress, and/or displace the adjacent ON, the internal carotid artery (ICA), its branches, and the oculomotor nerve. Morbidity associated with CM surgery included injury to the optic and oculomotor nerves, the ICA, and its branches is reported to be high. Mortality rate was as high as 32% in earlier series mainly due to major vessel injuries.
We present a case of a 32-year old female patient with monocular visual deterioration due to a clinoid meningioma of the left anterior clinoid process. Complete surgical removal has been achieved under microscopic vision in the University Hospital of Patras in Greece. Patient’s vision recovered completely.