?????????????!!!

?posterior cerebral circulation??????????????????????posterior circulationischemia,PCI?????????20%
1:??????
50?????trensient ischemic attack, TIA??????????????????\"?\"carotid insufficiency???\"???\"(vertebrobasilar insufficiency, VBI)????VBI???TIA????????
?????????????TIA???????
????????VBI??????L?/?????VBI?VBI???VBI????????????????VBI?]???Z?????????
2?????
1980???PCI?????1PCI????????????2??????3????CT,TCD,MRI,SPECTPET???N????4???PCI???????PCI
??PCI?VBI?
3????
PCI??TIA??????????TIA??????????
MR...