Unilateral malignant optic glioma following glioblastoma mul
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Malignant optic gliomas are rare, but they rapidly become lethal visual pathway tumors. This article presents the clinical course, treatment, and prognosis of a case of unilateral malignant optic glioma in a young man with a history of brain glioblastoma multiforme (GBM).

Case presentation
A 21-year-old man, who had GBM 7 years ago complained of a transient shadow in his vision and presented with normal visual acuity but optic disc edema and an enlarged blind spot in the right eye (oculus dexter, OD). Magnetic resonance imaging (MRI) showed a right intraorbital optic nerve tumor without a brain lesion. Chiasm involvement and severe vision deterioration occurred 3 months later. A biopsy of the right optic nerve revealed glioblastoma. Concurrent chemoradiotherapy (CCRT) prevented the involvement of the fellow eye 1 year after symptom onset.

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