Variation in form on the circle of Willis as studied by 3D-TOF MR angiography.
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概要
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The circles of Willis in 2011 patients were examined by 3-dimensional time-of-flight MR angiography in order to evaluate the variations. The Al segment of the anterior cerebral artery was not found in 4.8% on the right side and in 3.4% on the left side. In the older patients, MRA failed to demonstrate either the right or left Al segment. A fetal configuration, whereby P1 segments had a smaller diameter than the posterior communicating artery and the posterior cerebral artery derived predominantly from the carotid artery, occurred in 19.8% on the right side and in 16.7% on the left side. MRA did not reveal the posterior communicating artery to be more common in the elderly. The circulatory states in the circle of Willis may alter with aging.
- 一般社団法人 日本脳卒中学会の論文
一般社団法人 日本脳卒中学会 | 論文
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