有时，此处骨管缺如，约占5%~15%，膝状神经节与硬脑膜直接相接。
硬脑膜外血肿可发生于任何年龄，但是以15~30岁的青少年比较多见。
1·If the stupor is not deep, the body looks up when possibly discovered that the mild meninx stimulation symptom as well as the bureau stove nerve suffers injury the symptom.
若昏迷不深，体查时可能发现轻度脑膜刺激症状以及局灶性神经受损体征。