optic nerve enlargement

Optic nerve

Hemangioblastoma with bilateral frontal lobe Oedema: a case report. Comparison of preoperative and postoperative MRI. The T1- and T2-weighted images show optic neuropathy before the operation. The T1 image shows isointensity (a), and the T2 and FLAIR images show hyperintensity (b, c). There was a significantly enhanced signal in the tumour after the enhancement scan (d). The FLAIR image shows hyperintensity of the left optic chiasma, visual radiation, and bilateral frontal lobe (e, f, g)

Optic nerve

sheath meningioma: a case report. Axial MR image (T1 with fat saturation). An isointense to brain and optic nerve (arrow) lesion which produces exopthalmos. The lesion appears as marked widening along the path of the optic nerve but there is no intracranial extension.

Optic nerve

sheath meningioma: a case report. Axial MR image (T2 with fat saturation). The lesion is slightly hyperintense to the optic nerve (arrow).

Optic nerve

sheath meningioma: a case report. Axial MR image (T1 with fat saturation) after intravenous administration of paramagnetic media. There is homogeneous intense enhancement producing a "tram track" appearance around the hypointense optic nerve. Surrounding structures remain intact.