Kuuliala I
Clin Radiol. 1980 Mar;31(2):155-9. doi: 10.1016/s0009-9260(80)80143-7.
Changes in visibility or configuration of the suprasellar cistern are often the only signs on a CT scan of a patient with a juxtasellar expansion. Normal variations of this subarachnoid space on a CT scan are side for anatomical and technical reasons. The ability to differentiate between normal and abnormal in this area is essential in interpreting computed axial tomograms. To determine normal variants of the suprasellar cistern, 456 consecutive standard tomograms interpreted as normal were reviewed. The cistern was visible in 73.7% of the scans and the shape of the cistern was found to be either hexagonal (71.5%) or tetragonal (28.5%). The visible content of the cistern included the anterior part of the third ventricle (55.5%), the optic nerves and/or chiasm (52%) and the dorsum sellae (34.9%). The content of the cistern could not be accurately defined in 24.8% of the scans. In about one-fourth of the scans the suprasellar subarachnoid space was not visualised at all. If any doubt exists as to the visibility and configuration of the suprasellar cistern when there is a clinical suspicion of a juxtasellar tumour, additional investigations must be performed.
鞍上池形态或结构的改变常常是鞍旁占位患者CT扫描的唯一表现。由于解剖和技术原因，CT扫描时该蛛网膜下腔会出现正常变异。在解读计算机断层扫描图像时，区分该区域正常与异常情况的能力至关重要。为确定鞍上池的正常变异情况，我们回顾了456例连续的解读为正常的标准断层扫描图像。在73.7%的扫描图像中可看到鞍上池，其形状为六边形（71.5%）或四边形（28.5%）。鞍上池内可见的结构包括第三脑室前部（55.5%）、视神经和/或视交叉（52%）以及鞍背（34.9%）。在24.8%的扫描图像中，鞍上池内结构无法准确界定。约四分之一的扫描图像中完全看不到鞍上蛛网膜下腔。当临床上怀疑有鞍旁肿瘤而对鞍上池的可视性和形态存在疑问时，必须进行进一步检查。
