A characteristic "notch" in the petrous bone is described in relation to the superior outline of the jugular foramen. This notch seems to be a congenital anomaly and has a close relationship with ectasia of the dome of the internal jugular vein, as was demonstrated in two patients.
关于颈静脉孔的上缘,在岩骨中描述了一种特征性“切迹”。这种切迹似乎是一种先天性异常,并且如在两名患者中所证实的那样,与颈内静脉球部扩张密切相关。