[The value and importance of CT and MRI for diagnosing optic nerve sheath meningiomas].
OBJECTIVE
To study the value and importance of CT and MRI for diagnosing optic nerve sheath meningiomas.


METHODS
Fifteen patients with optic nerve sheath meningiomas were analyzed with CT and MRI and were confirmed by operation and pathological examination.


RESULTS
The CT image was enhanced in 2 cases of intracranial extension of the optic nerve sheath meningiomas; for the examination of MRI without Gd-DTPA shown the lesion was extended in 2 cases and the positive result of MRI with Gd-DTPA was consistent with the diagnosis of the brain tumor in 9 cases.


CONCLUSIONS
MRI with Gd-DTPA has been proved to be valuable in detecting intracranial extension of optic nerve sheath meningiomas that are not well visualized on enhanced CT and standard MRI, and should be used as a routinely examination of optic nerve sheath meningiomas before and after orbital surgery.
Institute of Orbital Diseases, Armed Police General Hospital, Beijing 100039, China. xiaolihuawj@sina.com
Li-hua
LH
Xiao
Xiao-zhong
XZ
Lu
D000293:Adolescent; D000328:Adult; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008579:Meningioma / Q000175:diagnosis* / Q000601:surgery; D008875:Middle Aged; D019574:Optic Nerve Neoplasms / Q000175:diagnosis* / Q000601:surgery; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
D019786:Gadolinium DTPA