Abstract
To the Editor: I have read the research letter entitled “Unruptured intracranial aneurysms: incidence of rupture and risk factors” by Ishibashi et al with great interest.1 I felt the need to clarify a few points regarding the aneurysm size as one of the well-known risk factors. The authors emphasized on the results of the International Study on Unruptured Intracranial Aneurysms (ISUIA) reporting a rupture rate of approximately 0.1% per year for aneurysm <7 mm in diameter.1,2 Ishibashi et al reported an overall incidence of 1.4%.1 Since their study was carried out in Japan, the authors attributed this discrepancy to racial difference and cited an article indicating Japanese and Finnish descendents might have higher potential for aneurysm rupture.3 I …
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