Optic nerve glioma with complete intraocular extension

To present a rare presentation of optic nerve glioma (ONG) with total intraocular extension.
A 44-year-old man with a history of loss of vision since childhood and recent development of progressive disfiguring proptosis was referred.
The vision in the affected eye was no light perception, and a proptosis of about 2–3 mm was present. Computed tomography and Magnetic Resonance Imaging (MRI) of brain/orbit showed a fusiform enlargement of the left optic nerve and total filling of vitreous cavity by a mass with high signal intensity in T2-weighted MRI. There was no extension into the intracranial cavity. The patient also had no signs of neurofibromatosis. Histopathology confirmed the diagnosis of ONG of the left orbit with extension into the globe and filling vitreous cavity.
ONG may extend to the vitreous cavity with no simultaneous intracranial involvement.