With the nationwide spread of MRI coupled with the regular brain checkup system in Japan, clinicians often incidentally come across the asymptomatic cerebrovascular diseases during routine medical examinations, and the importance of these disorders has been gradually recognized. For example, asymptomatic cerebral infarctions, also known as “silent brain infarctions,” have recently been identified as an independent risk factor for stroke.1 To reduce the number of the stroke patients and the patients requiring long-term care, asymptomatic cerebral infarction has become one of the diseases to which we should pay more attention, and assessing the appropriate clinical response to it is important. In addition, considering the mortality rate and morbidity are high once such a cerebral aneurysm ruptures, and that clinicians come across asymptomatic cerebrovascular diseases surprisingly frequently,2-5 a set of guidelines presenting the appropriate clinical response and the steps we should take is eagerly awaited.
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© 2011 Published by Elsevier Inc.