作者报告7例经病理证实的小脑幕上疝并结合文献报告的45例加以叙述.当后颅窝肿块迅速增大时,常可发生小脑扁桃体疝,如果此疝没有导致病人死亡,后颅窝增加的压力就可能引起小脑幕切迹上疝.如肿块起源于小脑幕切迹附近(例如小脑蚓部肿瘤)、当侧脑室引流减轻了阻塞性脑积水和颅高压之后,在小脑幕切迹较大时都比较容易发生小脑幕切迹上疝.小脑幕切迹大小变异较大,这种变异可能影响 The authors reported 7 cases of pathologically confirmed supraventricular naevi and combined with 45 cases reported in the literature. When the posterior cranial mass rapidly increases, the cerebellar tonsil hernia can often occur. If the hernia does not cause the patient to die, the posterior fossa Increased pressure may cause supination on the tentorium notch. If the mass originates from the vicinity of the tentorium notch (for example, a tumor of the cerebellar vermis), and when the lateral ventriculum drainage relieves obstructive hydrocephalus and intracranial hypertension, the cerebellar keratotomy When the track is large, it is relatively easy to occur on the small incision of the tentorium. There is a large variation in the size of the subtenon notch, and this variation may affect