Previous studies showed that before the pial artery large dilation which were widely observed in CSD, there is also a small constriction occurring in pial arteres.

• 已有研究表明,在普遍被观察到的CSD过程中软脑膜动脉血管大幅度舒张之前,还存在一个较小幅度的软脑膜动脉扩张和收缩。