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Unruptured cerebral aneurysms do not shrink when they rupture: multicenter collaborative aneurysm study group.
MedLine Citation:
PMID:  21150760     Owner:  NLM     Status:  In-Process    
BACKGROUND: The International Study of Intracranial Aneurysms found that for patients with no previous history of subarachnoid hemorrhage, small (< 7 mm) anterior circulation and posterior circulation aneurysms had a 0% and 2.5% risk of subarachnoid hemorrhage over 5 years, respectively.
OBJECTIVE: To determine whether cerebral aneurysms shrink with rupture.
METHODS: The clinical databases of 7 sites were screened for patients with imaging of cerebral aneurysms before and after rupture. Inclusion criteria included documented subarachnoid hemorrhage by imaging or lumbar puncture and intracranial imaging before and after cerebral aneurysm rupture. The patients were evaluated for aneurysm maximal height, maximal width, neck diameter, and other measurement parameters. Only a change of ≥ 2 mm was considered a true change.
RESULTS: Data on 13 patients who met inclusion criteria were collected. The median age was 60, and 11 of the 13 patients (84.6%) were female. Only 5 patients had posterior circulation aneurysms. None of the aneurysms had a significant decrease in size. One aneurysm decreased by 1.8 mm in maximum size after rupture (7.7%). Six aneurysms had an increase in maximum size of at least 2 mm after rupture (46.2%) with a mean increase of 3.5 mm (± 0.5 mm).
CONCLUSION: Unruptured aneurysms do not shrink when they rupture. The large percentage of ruptured small aneurysms in previous studies were likely small before they ruptured.
Maryam Rahman; Christopher S Ogilvy; Gregory J Zipfel; Colin P Derdeyn; Adnan H Siddiqui; Ketan R Bulsara; Louis J Kim; Howard A Riina; J Mocco; Brian L Hoh
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Neurosurgery     Volume:  68     ISSN:  1524-4040     ISO Abbreviation:  Neurosurgery     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7802914     Medline TA:  Neurosurgery     Country:  United States    
Other Details:
Languages:  eng     Pagination:  155-60; discussion 160-1     Citation Subset:  IM    
Department of Neurosurgery, University of Florida, Gainesville, Florida 32610, USA.
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