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Comprehensive Endovascular and Open Surgical Management of Cerebral Arteriovenous Malformations
Published on: October 20, 2017
Healing process for cerebral dissecting aneurysms presenting with subarachnoid hemorrhage
Tohru Mizutani1, Hideaki Kojima, Shunji Asamoto
1Department of Neurosurgery, Tokyo Metropolitan Fuchu Hospital, 2-9-2 Musasidai, Fuchu City, Tokyo 183-8524, Japan. mizutani@fuchu-hp.fuchu.tokyo.jp
Neurosurgery
|January 28, 2004
Summary
Cerebral dissecting aneurysms with subarachnoid hemorrhage heal through neointimal proliferation. This healing process, involving new tissue growth, may take over a month to complete depending on injury severity.
Area of Science:
- Neuropathology
- Vascular Biology
Background:
- Cerebral dissecting aneurysms can present with subarachnoid hemorrhage (SAH), a critical condition requiring investigation into its pathological healing mechanisms.
- Understanding the chronological healing process of these aneurysms is crucial for managing patient outcomes.
Purpose of the Study:
- To conduct a pathological examination of cerebral dissecting aneurysms presenting with SAH.
- To investigate the chronological healing process and identify key cellular mechanisms involved in aneurysm repair post-SAH.
Main Methods:
- Analysis of 13 dissecting aneurysms from patients presenting with SAH, collected between 6 hours and 35 days post-onset.
- Pathological examination using immunohistochemical staining to focus on the healing process.
- Specimens were obtained from autopsy (8) and surgical resection (5).
Main Results:
- Disruptions in the internal elastic lamina and media were observed in all dissecting aneurysms.
- Neointimal proliferation, characterized by new smooth muscle cells and collagen, was the primary healing mechanism.
- The neointima extended from the disrupted ends of the media towards the ruptured site.
Conclusions:
- Neointimal proliferation initiates the healing of cerebral dissecting aneurysms after SAH.
- Complete healing may extend beyond one month, influenced by the severity of the vascular wall injury.
- The study highlights the dynamic nature of aneurysm repair following SAH.
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