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CC BY-NC-ND 4.0 · Asian J Neurosurg 2020; 15(02): 431-433
DOI: 10.4103/ajns.AJNS_353_19
Case Report

The histopathological findings of two nonbranching saccular cerebral aneurysms

Satoru Kida
Department of Neurosurgery, Japanese Red Cross Shizuoka Hospital, Shizuoka
,
Hiroshi Tenjin
Department of Neurosurgery, Japanese Red Cross Shizuoka Hospital, Shizuoka
,
Tsutomu Tokuyama
Department of Neurosurgery, Japanese Red Cross Shizuoka Hospital, Shizuoka
,
Osamu Saito
Department of Neurosurgery, Japanese Red Cross Shizuoka Hospital, Shizuoka
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Cerebral aneurysms arising from nonbranching sites are different from ordinary branching aneurysms in clinical course and histology. We pathologically examined two cases of saccular aneurysm occurring at nonbranching sites. One was a pseudoaneurysm arising at a branch of the right pericallosal artery. The other had an entirely hyalinized and thickened aneurysmal wall. Despite similar angiographical findings, our two cases had different pathological features as described above. Based on the pathological findings obtained from these cases, we believe that aneurysms in nonbranching sites are caused by injury to the internal elastic lamina. A ruptured aneurysm may be discovered as a blood blister-like aneurysm, whereas an unruptured one may develop into a “nonbranching true aneurysm.”

Key-words:

Arterial dissection - internal elastic lamina - nonbranching aneurysm

Financial support and sponsorship

Nil.




Publication History

Received: 05 December 2019

Accepted: 19 January 2020

Article published online:
16 August 2022

© 2020. Asian Congress of Neurological Surgeons. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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