Nakajima K, Watanabe H, Chigasaki H, Ishii S
No Shinkei Geka. 1977 Mar;5(3):243-51.
The radiological characteristics of intraventricular tumors were studied with special reference to differential diagnosis from paraventricular tumors by careful analysis of seven cases intraventricular tumors and five cases paraventricular tumors. As, in the radiological term, intraventricular tumors have been dividied into two groups according to their location by Bernasconi et al., seven cases intraventricular tumors reported in this paper were also divided into two groups; 1) 2 cases ependymom occupying the frontal horn and the body of lateral ventricle, 2) 4 cases meningioma and one plexus papilloma occupying the trigone and the adjucent regions. In case of tumors belonged to group 1, the filling defect showing the circumference of tumors and the associated unilateral hydrocephalus were characteristic findings on the ventriculogram, while the depression of ventricular wall was observed in paraventricular tumors. Angiographic characteristics in group 1 tumors were the splay of subependymal veins of the medial group from those of lateral group and the increased density of deep veins due to raised circulation, and these findings demonstrated in all cases of ependymoma reported here. On the other hand, in all meningiomas belonged to group 2, the hypertrophia of choridal arteries was noticed in the angiogram. Moreover, the anterior choroidal artery was shown to be divided into two branches at its plexal segments, and the tumor stain at the trigone always lied between these two branches. We named this dissociation of these two plexal branches due to tumor as "flare sing". This is considered to be specific finding for a trigone meningioma, and this "flare sing" was observed in all of our 4 cases meningioma. In two cases out of four, the inferior ventricular vein was displaced anteriorly delineating the anterior margin of the tumor. This again is considered as a sign indicating the tumor occupying the trigone and adjacent regions.
通过对7例脑室内肿瘤和5例脑室旁肿瘤进行仔细分析，研究了脑室内肿瘤的放射学特征，特别参考了与脑室旁肿瘤的鉴别诊断。在放射学术语中，根据其位置，Bernasconi等人已将脑室内肿瘤分为两组，本文报道的7例脑室内肿瘤也分为两组：1）2例室管膜瘤占据额叶角和侧脑室体部；2）4例脑膜瘤和1例丛状乳头状瘤占据三角区及相邻区域。对于属于第1组的肿瘤，脑室造影上显示肿瘤周边的充盈缺损和相关的单侧脑积水是特征性表现，而脑室旁肿瘤则观察到脑室壁凹陷。第1组肿瘤的血管造影特征是内侧组室管膜下静脉与外侧组室管膜下静脉分开，以及由于循环增加导致深静脉密度增加，本文报道的所有室管膜瘤病例均显示出这些表现。另一方面，在所有属于第2组的脑膜瘤中，血管造影中均注意到脉络膜动脉肥大。此外，前脉络膜动脉在其丛状段显示分为两个分支，三角区的肿瘤染色总是位于这两个分支之间。我们将由于肿瘤导致的这两个丛状分支的分离称为“flare sing”。这被认为是三角区脑膜瘤的特异性表现，在我们所有4例脑膜瘤中均观察到这种“flare sing”。在4例中的2例中，脑室下静脉向前移位，勾勒出肿瘤的前缘。这再次被认为是肿瘤占据三角区及相邻区域的一个征象。
