Rutka J D, Sharpe J A, Resch L, Fleming J F
J Clin Neuroophthalmol. 1985 Sep;5(3):194-8.
Progressive monocular visual loss was the presenting manifestation of a cystic ependymoma arising from the third ventricle. Extracerebral extension of the tumor into the prechiasmatic cistern compressed the right optic nerve. Subfrontal extension caused erosion of the planum sphenoidale. Subtotal excision of the tumor was followed by cranial irradiation, and no further visual loss occurred. Extracerebral growth of primary intracerebral gliomas may cause optic neuropathy that is indistinguishable from other compressive neuropathies.
进行性单眼视力丧失是起源于第三脑室的囊性室管膜瘤的首发表现。肿瘤向脑外延伸至视交叉前池，压迫右侧视神经。额叶下延伸导致蝶骨平台侵蚀。肿瘤次全切除后进行了颅脑照射，未再出现视力丧失。原发性脑内胶质瘤的脑外生长可能导致视神经病变，与其他压迫性神经病变难以区分。
