OPTIC NERVE SHEATH MENINGIOMAS: Role of MR Imaging

摘要: Romberg, 72 writing in 1853 his A Manual of the Nervous Diseases Man , states that "At base brain and cranium, conducting power optic nerve is chiefly interrupted by tumors extravasations." In textbook published 1888, Gowers 23 discusses psammomata as a category intracranial tumor separate from sarcoma. He "psammomata are small consisting fibrous tissue mingled with particles `brain sand,' such occurs pineal gland or choroid plexus—calcareous particles, which sometimes aggregated into larger irregular masses. These growths usually spring dura mater at brain, plexus, form hemispherical tumors, reddish gray, smooth hard." undoubtedly what today called meningiomas. 1938, Cushing Eisenhardt 15 their now classic book Meningiomas . this authors compiled clinical pathologic information on 313 cases intraspinal meningiomas operated upon classified histologically Eisenhardt. They begin discussing history ideas terminology relative to up time. Despite scant recognition afforded primary meningeal texts even prominent early neurologists cited previously, were able sketch evolution thinking about these tumors. noted hyperostosis could be found skulls preserved prehistoric times examples had been described over several centuries under term fungus durae matris without any unifying concept caused it. Louis 49 Paris for having written seminal monograph 1774 titled Memoire sur les tumeurs fongeuses de la dure-mere Table 1 outlines set forth Eisenhardt's book. We have chosen truncate discussion classification because recent methods supplanted earlier efforts many One pivotal was articulated following quote an paper wrote Bailey Eisenhardt: 2 Though meningioma serves connote definite unmistakable sort, cellular components growth (meningoblasts) apparently capable differentiating meningothelial (i.e., endothelial mesothelial), fibroblastic angioblastic types, possibly indeed osteoblasts other types cells. What more, one may develop sarcomatous tendencies. Before leaving landmark publication meningiomas, let us consider main points put chapter sheath Schwalbe, proper subject article. Let start direct opening paragraph, seems zero heart matter : In years ophthalmic surgeon, earliest surgical specialist, neurosurgeon, latest, opposite directions come meet barrier foramen—each somewhat hesitant trespass other's field work. however much learn another between them answer should forthcoming moot question: Do intraorbital within Schwalbe arise there primarily they invariably extended source? On side orbital origin cite case reported Pagenstecher 66 presented young woman recurred deeper orbit 25 later. She died meningitis second intervention, autopsy same type end canal. It seemed likely if originated part, component would two, it not. Byers 6 author proposed became secondarily. Eisenhardt, however, appearance identical olfactory groove favored idea along foramen. The also recognized arising outside muscle cone no connection sheath. believed invaded bone present orbit. Dandy 17 Schott 75 effect predilection region mention not find clear example demonstrated normal either tumor. approaches used deal nicely laid out Figure 235 (Fig. 1). ophthalmologist limited transglobal approach sacrificed eye until advent Kronlein through lateral 1887. Neurosurgeons accessed posterior subtemporal indicated figure. concluded, favoring roof, he thought might become choice many, most especially question extension.