Neurological Surgery No Shinkei Geka Volume 25, Issue 2 (February 1997)

Histopathological examinations of dural arteriovenous malformations of posterior fossa Jin MOMOJI 1 , Jiro MUKAWA 2 , Katsumi YAMASHIRO 2 , Yasunari ISHIKAWA 2 , Kunio OKUYAMA 2 , Takayoshi TODA 3 1Department of Neurosurgery, Okinawa Prefectural Miyako Hospital 2Department of Neurosurgery, University of the Ryukyus School of Medicine 3Department of Clinical Laboratory Medicine, University of the Ryukyus School of Medicine Keyword: dural arteriovenous malformation , posterior fossa , histopathology , sinus thrombosis , embolization pp.137-142
Published Date 1997/2/10
  • Abstract
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Two cases of dural arteriovenous malformation (DAVM) of the posterior fossa were presented and a histopathological examination was described.

After embolization of the feeding arteries, DAVMs of the posterior fossa were removed with the adjacent sinus. Serial sections of the surgical specimens showed an abnormal mass with dilated, tortuous vessels of varying diameters in the sinus wall, and partially hyali-nized connective tissue around the vessels. The elastic lamina of the sinus wall was interrupted and a mass of abnormal vessels developed into the subintimal layer of the sinus. Fistulas, about 200μm in diameter, were formed between arterialized dural veins and dural arte-ries which had obvious internal elastic lamina. An open-ing of the fistula of the abnormal vessel, 25μm in dia-meter, to the sinus lumen was also seen. No stage of organized thrombus could be seen in the sinus lumen. These findings strongly suggested that physiologically existing arteriovenous fistulas within the dura mater, which have been reported by Kerber et al, had de-veloped due to many factors which increase intracranial pressure. They protruded into the sinus lumen in such a way that it could cause stenosis or obstruction of the sinus.

In conclusion it can be said that an obstructive lesion of dural sinus is considered of itself to be DAVM in most cases and sinus thrombosis is the result of the DAVM.

Copyright © 1997, Igaku-Shoin Ltd. All rights reserved.


Neurological Surgery 脳神経外科
25巻2号 (1997年2月)
電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院