School of Radiological Technology, Faculty of Health Science Technology, HRH Princess Chulabhorn College of Medical Science, Chulabhorn Royal Academy, Bangkok, Thailand.
Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand; In Silico and Clinical Anatomy Research Group (iSCAN), Bangkok, Thailand.
Ann Anat. 2023 Oct;250:152133. doi: 10.1016/j.aanat.2023.152133. Epub 2023 Jul 17.
The clivus forms the central skull base between the dorsum sellae and the foramen magnum. Although bony variations of the inferior surface of the clivus are well-recognized and have been well studied, studies of bony variations of the basilar (superior) surface of the clivus are scarce. Therefore, the present study was performed to investigate bony anatomical variations on the basilar part of the clivus.
Computed tomography scans belonging to 407 Indian subjects from the CQ500 open-access dataset were retrospectively reviewed.
Bony tubercles on the basilar surface of the clivus were found in 40 cases (9.83%). They were classified into three types including single, double and triple. A single tubercle was found in 35 cases (8.60%) including 12 on the left (2.95%), 10 on the right (2.46%) and 13 in the center (3.19%). The tubercles were doubled in four cases (0.98%) and tripled in one case (0.25%). The average width and height of the tubercles were 4.4 ± 1.5 mm (range 1.4-7.9 mm) and 1.7 ± 0.7 mm (range 0.8-4.2 mm), respectively. Ninety-five (95%) percent of the tubercles were located on the lower half of the clivus.
To our knowledge, these tubercles have not been previously described. Therefore, we suggest the terms "basilar tubercles of the clivus" and "basilar eminences of the clivus", depending on their sizes. Knowledge of these newly described structures is important when interpreting radiological images of the skull base.
斜坡构成鞍背和枕骨大孔之间的中央颅底。虽然斜坡下表面的骨变异是公认的，并已得到很好的研究，但对斜坡基底（上）表面的骨变异的研究却很少。因此，本研究旨在探讨斜坡基底的骨性解剖变异。
回顾性分析了来自 CQ500 开放获取数据集的 407 名印度受试者的计算机断层扫描。
在 40 例（9.83%）中发现了斜坡基底表面的骨性结节。它们分为三种类型，包括单发、双发和三发。35 例（8.60%）为单发结节，其中 12 例位于左侧（2.95%），10 例位于右侧（2.46%），13 例位于中心（3.19%）。4 例（0.98%）为双发结节，1 例（0.25%）为三发结节。结节的平均宽度和高度分别为 4.4±1.5mm（范围 1.4-7.9mm）和 1.7±0.7mm（范围 0.8-4.2mm）。95%（95%）的结节位于斜坡的下半部分。
据我们所知，这些结节以前没有描述过。因此，我们建议根据其大小使用术语“斜坡基底结节”和“斜坡基底隆起”。了解这些新描述的结构对于解释颅底的影像学图像很重要。
