Pedunculated Basilar Terminus Aneurysm with Pseudo-Septation due to Anterior Herniation through a Perforated Membrane of Liliequist

Septations within cerebral arteries or aneurysms are exceedingly rare in the absence of associated fenestrations. We report an unusual unruptured pedunculated basilar apex aneurysm, with a "pseudoseptation" between the main aneurysmal sac and an anterior compartment, which was, in fact, re...

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Bibliographic Details
Published in:American journal of neuroradiology : AJNR 2009-10, Vol.30 (9), p.1688-1690
Main Authors: Hacein-Bey, L, Varelas, P.N
Format: Article
Language:English
Subjects:
Adult
Arachnoid - diagnostic imaging
Arachnoid - injuries
Biological and medical sciences
Electrodiagnosis. Electric activity recording
Encephalocele - complications
Encephalocele - diagnostic imaging
Female
Humans
Interventional
Intracranial Aneurysm - diagnostic imaging
Intracranial Aneurysm - etiology
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Miscellaneous. Technology
Nervous system
Radiodiagnosis. Nmr imagery. Nmr spectrometry
Radiography
Rupture - complications
Rupture - diagnostic imaging
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Description
Summary:Septations within cerebral arteries or aneurysms are exceedingly rare in the absence of associated fenestrations. We report an unusual unruptured pedunculated basilar apex aneurysm, with a "pseudoseptation" between the main aneurysmal sac and an anterior compartment, which was, in fact, represented by a perforation in the membrane of Liliequist, permitting anterior aneurysmal herniation into the carotid-chiasmatic cistern. The patient was successfully treated with detachable coils. This case is unusual on 2 accounts: 1) the aneurysm's appearance, and 2) the presence of a large fenestration in the membrane of Liliequist, of which anatomic features are herein reviewed.
ISSN:0195-6108
1936-959X
DOI:10.3174/ajnr.A1624