Three-dimensional Computed Tomography Angiography of the Galenic System for the Occipital Transtentorial Approach
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概要
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The venous variations of the galenic system were evaluated using three-dimensional computed tomography angiography [3D-CTA] to assess the influence on the occipital transtentorial approach in 150 patients who underwent 3D-CTA as a routine screening examination for cerebrovascular diseases. The variations of the vein of Galen with its tributaries, the tentorial sinus, and the veins around the tentorium were evaluated in multiple intensity projections and stereoscopic images. The angle between the vein of Galen and the straight sinus was 67.1±31.9°(mean±SD). Observation of the pineal body from the direction of the approach tended to extend to the quadrigeminal bodies in acute angle cases, and to the third ventricle in obtuse angle cases. Bilateral internal cerebral veins (ICVs) joined in the anterior portion were associated with a long vein of Galen, or in the posterior portion with a short vein of Galen. The distance between the bilateral ICVs was 4.66±2.28 mm (mean±SD), and the shape of the space could be classified as spindle, parallel, hairpin, and round types. The basal vein could be classified into well-developed, hypoplastic, hardly recognized, and mimicking two basal veins because the tributary did not join but ran parallel to the basal vein. The drainage pathways lead to the anterior or posterior portion of the vein of Galen, the ICV, the tentorial sinus, and the superior petrosal sinus. The various types of the tentorial sinus and primitive tentorial sinus which might be sacrificed during section of the tentorium were confirmed. The inferior cerebral vein draining to the tentorial sinus could be seen. 3D-CTA could also demonstrate the presence, the course, and the drainage points of the internal occipital vein, the precentral cerebellar vein, the posterior pericallosal vein, and so on. 3D-CTA is useful to evaluate the variations of the venous system and the relationship with the tumor, and for preoperative simulation and intraoperative navigation of the occipital transtentorial approach.
- 日本脳神経外科学会の論文
- 2005-08-15
著者
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SUZUKI Yasuhiro
Department of Information Processing, Tokyo Institute of Technology
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Abe Takumi
日本大学 医学部脳神経外科学講座
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Abe Takumi
Department Of Neurosurgery Showa University School Of Medicine
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Abe Takumi
Department Of Advanced Materials Science Graduate School Of Frontier Sciences University Of Tokyo
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IKEDA Hisato
Department of Neurosurgery, Showa University School of Medicine
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NAKAJIMA Masateru
Department of Neurosurgery, Showa University School of Medicine
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Suzuki Yasuhiro
青森県立中央病院 脳神経外科
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Ikeda Hisato
Department Of Neurosurgery Showa University School Of Medicine
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Nakajima Masateru
Department Of Neurosurgery Showa University School Of Medicine
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Suzuki Yasuhiro
Department Of Breast And Endocrine Surgery Tokai University School Of Medicine
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