Abstract:
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.
journal_name
Neurosurgeryjournal_title
Neurosurgeryauthors
Rahman M,Ogilvy CS,Zipfel GJ,Derdeyn CP,Siddiqui AH,Bulsara KR,Kim LJ,Riina HA,Mocco J,Hoh BLdoi
10.1227/NEU.0b013e3181ff357csubject
Has Abstractpub_date
2011-01-01 00:00:00pages
155-60; discussion 160-1issue
1eissn
0148-396Xissn
1524-4040pii
00006123-201101000-00020journal_volume
68pub_type
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