Color Doppler Ultrasound Imaging of Primary Optic Nerve Sheath Meningioma

Abstract

A 72-year-old woman presented with a history of progressive blurred vision of the left eye for more than 10 years and left proptosis for about 3 years. Her best-corrected visual acuity was 20/20 in the right eye and 20/200 in the left eye. Examination of the left fundus revealed temporal pallor of the optic disc and abnormal retinal vascular architecture. A retrobulbar intraconal lesion was seen on magnetic resonance imaging (MRI), which displaced the optic nerve upward and laterally to the left. Color Doppler flow imaging showed a globular, retrobulbar solid mass with the high-blood-flow hemodynamics of a tumor, compared to the low-blood-flow hemodynamics of normal orbital tissue. The tumor was partially excised and the immunohistopathologic diagnosis was meningothelial meningioma. The proptosis improved after surgery, but the corrected visual acuity remained the same in the first year of postoperative follow-up.