Department of Neurological Surgery, Juntendo University Urayasu Hospital, 2-1-1 Tomioka, Urayasu, Chiba, 279-0021, Japan.
Division of Radiological Technology, Medical Satellite Yaesu Clinic, Tokyo, Japan.
Surg Radiol Anat. 2021 Aug;43(8):1353-1357. doi: 10.1007/s00276-021-02701-0. Epub 2021 Feb 7.
To date, no study has explored the inferior sagittal sinus (ISS) using neuroimaging modalities. This investigation aimed to characterize it using magnetic resonance imaging (MRI).
A total of 77 patients with intact cerebral hemispheres and covering meninges underwent thin-sliced, contrast-enhanced MRI.
The ISS was well delineated as a linear structure with a constant diameter in 97% of the patients. The maximum intensity projection (MIP) images well delineated the three-dimensional architecture of the ISS and relevant veins. The identified ISSs could be classified into three different types, with the underdeveloped type being the most frequent at 47%. In addition, the ISSs showed considerable variability both in the original site and course along the lower margin of the falx cerebri. Furthermore, in 22% of the cases, fenestrations were identified in the falx cerebri adjacent to or near the ISS. More than 70% of them were located in the middle third of the falx, followed by the anterior and middle thirds of the falx.
The ISS is a constant venous structure characterized by morphological variability and may function as an adjunctive or assistive venous drainage route. Thin-sliced, post-contrast-enhanced sagittal MRI combined with MIP imaging is useful for exploring the ISS.
迄今为止，尚无研究使用神经影像学方法探索下矢状窦（ISS）。本研究旨在使用磁共振成像（MRI）对其进行特征描述。
共有 77 例大脑半球完整且脑膜完整的患者接受了薄层、增强 MRI 检查。
97%的患者中，ISS 被很好地描绘为具有恒定直径的线性结构。最大强度投影（MIP）图像很好地描绘了 ISS 和相关静脉的三维结构。确定的 ISS 可分为三种不同类型，以发育不良型最为常见，占 47%。此外，ISS 在大脑镰下缘的原始位置和走行上都有相当大的变异性。此外，在 22%的病例中，大脑镰邻近或靠近 ISS 处发现了裂隙。超过 70%的裂隙位于大脑镰的中三分之一，其次是前中三分之一。
ISS 是一种具有形态学变异性的恒定静脉结构，可能作为辅助或辅助静脉引流途径发挥作用。薄层、增强后矢状 MRI 结合 MIP 成像有助于探索 ISS。
