Arachnoidal Proliferation of Optic Nerve Simulating Extension of Intracranial Glioma

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Abstract
Direct extension into the orbital portion of the optic nerve by glioma originating within the cranial cavity has long been recognized as a serious and difficult problem.1,3,5,9,14Such tumors, as might be expected, originate most commonly from the prechiasmal portions of the optic nerves, from the optic chiasm, and from the neighboring regions of the frontal lobes of the brain. Thus, the diagnosis and management of these lesions usually require the attention of the ophthalmologist, the neurologist, and the neurosurgeon. Some reports in the past decade have indicated the frequency of orbital optic nerve involvement by such lesions and difficulties encountered in diagnosis and treatment.4,5,7,15 The case reported here is illustrative of many well recognized clinical features of this condition. It is recorded primarily to illustrate an unusual degree of arachnoidal meningeal proliferation which by clinical symptoms and signs, and appearance at surgical operation, closely resembled tumor invasion

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