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- W2384757500 abstract "Objective: To investigate anatomic variations of circle of Willis on 3D - TOF MR angiograms and its clinical significance. Methods: Two hundred and four cases of MR angiograms were retrospectively analyzed to count anatomic variations of every artery of circle of Willis, which were normal on MRI and 3D - TOF MR angiograms of brain. The arteries not shown on MR angiograms were regarded as absence. When the diameter of one artery of bilateral symmetric arteries was less than 1/2 of another's, it was regarded as hypogenesis. Results: On MR angiograms, the absence rate of A1 segment of anterior cerebral artery (ACA) was 8.3%, and its hypogenesis rate 10.8%; presence rate of anterior communicating artery (ACoA) 41.7% , but in male more than in female signifiantly; presence rate of fetaltype posterior cerebral artery (PCA) 29.9% ; presence rate of persistent trigeminal artery 0.5% . Conclusion: 3D - TOF MR angiography is a accurate non - invasive method for evaluating anatomic variations of circle of Willis." @default.
- W2384757500 created "2016-06-24" @default.
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- W2384757500 date "2002-01-01" @default.
- W2384757500 modified "2023-09-28" @default.
- W2384757500 title "Investigation of anatomic variations of circle of Willis by 3D - TOF angiography and its clinical significance" @default.
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