“…:' Recent widespread use of angiographic and computer scanning techniques, however, has allowed more precise definition of the extent of the tumor, as well as increased recognition of the intracranial component. 16,29,23,94 A review of recent cases reported by English,'" Jafek,':' Biller,l Gill, and Krekorian2" indicates that there has been a reversal to Krekorian's earlier discouraging observation that every patient with proven intracranial disease died. Conley pointed out, however, that extensions of the neoplasm into the base of the skull, the apex of the orbit, and the cavernous sinus, or into the optic chiasma, the optic nerves, or the dura, makes the extirpation a much more formidable task.'"…”