Multifocal malignant optic glioma of adulthood presenting as acute anterior optic neuropathy.

We report a 63-year-old, previously healthy female patient with glioblastoma multiforme of the optic nerve and chiasm presenting as acute anterior optic neuropathy. She presented with a 3-week history of progressively increasing headaches, retrobulbar pain, rapidly progressive visual loss in the right eye and blurred vision in the left eye. Early clinical examination revealed right optic disc swelling and she was initially diagnosed with demyelinating optic neuritis. Her clinical course deteriorated with total visual loss in the right eye and progressive visual loss in the left eye despite treatment with intravenous (IV) methylprednisone and IV immunoglobulins. MRI revealed enhancement of the right optic nerve and optic chiasm, with multiple periventricular hyperintense foci. Six weeks later, the patient presented with left facial palsy and left hemiparesis. Follow-up MRI showed multiple enhancing lesions in addition to the previous lesions involving right lentiform and right thalamic nucleus, right cerebral peduncle, right temporal and parietal lobes. Although the optic nerve biopsy was inconclusive, the brain biopsy revealed glioblastoma multiforme. This report demonstrated that malignant glioma of adulthood may be multicentric and may mimic optic neuritis clinically, which might help explain the difficulties in diagnosis.