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A Low Mortality Rat Model to Assess Delayed Cerebral Vasospasm After Experimental Subarachnoid Hemorrhage
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Basilar tip aneurysms and basilar tip anatomy.

C Campos1, A Churojana, G Rodesch

  • 1Neuroradiologie vasculaire diagnostique et thérapeutique, Hôpital de Bicêtre; Le Kremlin Bicêtre, France.

Interventional Neuroradiology : Journal of Peritherapeutic Neuroradiology, Surgical Procedures and Related Neurosciences
|August 3, 2010
PubMed
Summary

Basilar tip aneurysms show a high prevalence of caudal fusion, influencing perforating branch territories. Understanding this anatomy helps predict risks associated with P1 segment sacrifice.

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Area of Science:

  • Neurosurgery
  • Vascular Anatomy
  • Cerebrovascular Disease

Background:

  • Cerebral aneurysms, particularly those at the basilar tip, pose significant clinical challenges.
  • The anatomical variations of the distal basilar artery influence surgical approaches and outcomes.

Purpose of the Study:

  • To analyze the anatomical disposition of the distal basilar artery in basilar tip aneurysms.
  • To correlate anatomical variations with the origin and territory of perforating branches.
  • To predict risks associated with surgical interventions like P1 segment sacrifice.

Main Methods:

  • Retrospective review of 581 cerebral aneurysms from 1986-1997.
  • Detailed analysis of the anatomy of the distal basilar artery in 55 basilar tip aneurysms.
  • Classification of basilar artery fusion (symmetrical/asymmetrical) and aneurysm neck implantation.

Main Results:

  • Ninety-one percent of analyzed basilar tip aneurysms exhibited caudal fusion of the distal basilar artery.
  • Aneurysm necks were predominantly located on the caudal part of the fusion.
  • Caudal fusion variant supplied a small ipsilateral territory, while cranial arrangement often provided bilateral supply with interpeduncular anastomoses.

Conclusions:

  • The anatomical configuration of the distal basilar artery, specifically caudal fusion, is prevalent in basilar tip aneurysms.
  • Recognizing these anatomical variations aids in predicting the territory of perforating branches arising from the P1 segment.
  • This understanding is crucial for anticipating and mitigating risks during surgical management, including P1 segment sacrifice.