Demonstration of Cerebral Venous Variations in the Region of the Third Ventricle on Phase-Sensitive Imaging
Demonstration of Cerebral Venous Variations in the Region of the Third Ventricle on Phase-Sensitive Imaging
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DOI：
10.3174/ajnr.a1752
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发表时间：
2010-01-01
影响因子：
3.5
通讯作者：
Ogawa, T.
中科院分区：
文献类型：
--
作者：
Fujii, S.;Kanasaki, Y.;Ogawa, T.
背景和目的：磁化率加权 (SW) MR 成像实现了脑静脉的无创可视化，并揭示了静脉结构的本质。为了成功进行第三脑室手术，术前需要了解侧脑室室管膜下静脉的解剖结构及其与门罗孔的关系。本研究的目的是基于与 SW MR 成像相似的原理，利用相敏成像 (PSI) 评估第三脑室周围室管膜下静脉的解剖变化。 材料和方法：本研究包括 321 名患者的 642 侧。评估前间隔静脉（ASV）、丘纹静脉和大脑内静脉（ICV）的走行。我们根据标准经典血管造影标准将其分为 4 种类型（IA、IB、IIA、IIB）。根据先前研究的方法，分类是基于它们与 ASV-ICV 连接处的关系以及静脉角或假静脉角的存在。其他静脉变异分类为Ⅲ型。结果：形成静脉角519例（80.9%），假性静脉角123例（19.1%）。 642 侧中有 407 侧（63.4%）的 ASV-ICV 交界处位于静脉角（IA 型）。在 235 侧 (36.6%) 中，ASV-ICV 交界处位于 Monro 孔后方（IB、IIA、IIB 和 III 型）。 结论：PSI 对于了解第三脑室区域室管膜下静脉的正常变化很有用。
BACKGROUND AND PURPOSE: Susceptibility-weighted (SW) MR imaging has enabled noninvasive visualization of the cerebral veins and has shed light on the nature of venous architecture. For successful surgery of the third ventricle, understanding of the anatomy of the subependymal veins of the lateral ventricle and their relationships to the foramen of Monro is required preoperatively. The purpose of this study was to evaluate the anatomic variations of the subependymal veins around the third ventricle by use of phase-sensitive imaging (PSI) on the basis of principles similar to those of SW MR imaging.MATERIALS AND METHODS: Included in this study were 642 sides in 321 patients. The courses of the anterior septal vein (ASV), thalamostriate vein, and internal cerebral vein (ICV) were evaluated. We classified these into 4 types (IA, IB, IIA, IIB) on the basis of standard classic angiographic criteria. The classification is based on their relationship with the ASV-ICV junction and the presence of a venous angle or a false venous angle, according to the method in a previous study. Other venous variations were classified as type III.RESULTS: A venous angle was formed in 519 (80.9%), whereas a false venous angle was formed in 123 (19.1%). The ASV-ICV junction was located at the venous angle (type IA) in 407 (63.4%) of 642 sides. In 235 sides (36.6%), the ASV-ICV junction was located posteriorly beyond the foramen of Monro (types IB, IIA, IIB, and III).CONCLUSIONS: PSI is useful for understanding normal variations of the subependymal veins in the region of the third ventricle.