Optic nerve sheath meningioma

Case contributed by Ammar Haouimi
Diagnosis almost certain

Presentation

Right proptosis.

Patient Data

Age: 40 years
Gender: Female
mri

The MRI sequences demonstrate a well-defined right orbital mass (22 x 17 x 15 mm), surrounding the optic nerve which is displaced inferomedially. It elicits an isosignal to the cortical grey matter on both T1/T2 with vivid enhancement on postcontrast sequences. A minimal arachnoid fluid is noted between the globe and anterior margin of the tumor well-visualized on axial T2 fat sat. No extension into the optic canal is seen. There is a right axial proptosis grade I.

Case Discussion

MRI features most consistent with an optic nerve sheath meningioma with secondary axial proptosis grade I.

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