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Posterior circulation intracranial aneurysm

Intracranial aneurysms (IAs) located in the posterior circulation are considered to have higher annual bleed rates than those in the anterior circulation.

Aspect ratio and parent artery size were found to be predictive morphometric factors in differentiating between anterior and posterior cerebral IAs.

Aneurysms of the posterior circulation remain challenging lesions given their proximity to the brainstem and cranial nerves.


Many of these aneurysms may best be approached through a retrosigmoid-suboccipital craniectomy with a far-lateral transcondylar extension. In a narrated video illustration, Caplan et al. present the case of a 37-year-old man with an incidentally discovered right-sided anterior inferior cerebellar artery (AICA) aneurysm. Diagnostic studies included CT angiography and cerebral angiography. A suboccipital craniectomy and far-lateral transcondylar extension were performed for microsurgical trapping and excision of the AICA aneurysm. The techniques of the retrosigmoid craniectomy, C-1 laminectomy, condylectomy and microsurgical trapping of the aneurysm are reviewed. The video can be found here: 1).

Caplan JM, Jusue-Torres I, Kim JE, Luksik A, Liauw J, Gottschalk A, Tamargo RJ. Far-lateral transcondylar approach for microsurgical trapping of an anterior inferior cerebellar artery aneurysm. Neurosurg Focus. 2015 Jul;39(VideoSuppl1):V6. PubMed PMID: 26132623.
posterior_circulation_intracranial_aneurysm.txt · Last modified: 2015/07/02 17:43 (external edit)