The statistical observation for frequancy of occurence of the anencephalus

Chun, Y S; Lee, C S; Suh, S H

Abstract

Since Plater Felix called meningioma in 1614 for the first time, many authors reported about the diagnosticcharacteristics of meningioma in the way of incidence in radiology and pathology. In 1897, Obiei and Bollicidescribed about the early radiologic patterns and Sossman and Putnam in 1925 analyzed detail radiologic findingsfor meningioma. Recently, early diagnostic criteria for meningioma by cerebral angiography is successfully donefor better and confirmative preoperative diagnosis. Author collected 30 confirmed cerebral meningiomas andanalyzed into plain skull X-ray and carotid angiography, mostly in Severance Hospital of Yonsei University. At thesame time, author reviewed other reports in the literatures. Result : 1) Sexual incidence in author's report ismuch different from others that male patient are much more predominent in cerebral meningioma, in our hospital. 2)23 out of 30 cases (88%) show in between 30 through 50 years of age. The ordest is 58 and the youngest, 17 yearsof age. 3) Most of clinical symptoms are neurologic in origin (56%), and among them, headache(29%), convulsion andtwitching (18%), and walking disturbance(15%) etc. are frequently complained, however, protruded eyeball (18%) canbe visualized only in sphenoid or cribriform plate meningioma. Duration of illness are variable, and most of themshow over 3 years which is suggestive of chronic benign brain tumor. 4) Prevalent site of meningioma in our 30cases show ; parasagittal (40%), sphenoid ridge (33%), cerebral hemisphere (17%) in location and they are mostfrequent 3 prevalent site of meningioma, reported as in others literature. 5) Radiologic findings a) Simple skullseries show 4 most important nonspecific findings of hyperostosis(82%), dorsum sellae erosion(96%), increasedvessel grooves(57%) and localized bone destruction. However, psammoma calcifications are only 7% in incidence.Hyperostosis are frequently visualized in parasagittal meningioma, bone changes in sphenoid ridge meningioma, andincreased vessel grooves are frequent in parasagittal meningioma. b) 26 cases of cerebral angiogram are analyzed.Among them, nonspecific findigns are neovascularization (96%), displaced anterior cerebral artery (85%),circumferential vessels(81%), displaced middle cerebral artery(73%). Specific angiographic findings which issuggestive of meningioma are sharp deflection of vessels(92%), beading and irregular appearanced vessels(88%),simultaneous filling of external carotid artery (85%), displaced internal cerebral vein and venous angle(81%), andspecific meningioma cloud is only 65%. Angiographic findings in 26 meningiomas are much different from Jacobsonwho described characteristic angiographic findings, which are sharp deflection of vessels, simultaneous filling ofexternal carotid artery, and characteristic meningioma cloud mostly.