[異名]顱底扁平癥(platybasia,basilar impression),謝-阿-希綜合征,小腦髓部畸形。[病因病理]系由枕骨及上段頸椎先天發(fā)育畸形,致使小腦扁桃體向下異常延伸至枕骨大孔及椎管內(nèi),延腦及第四腦寶也向下伸延。后組顱神經(jīng)及頸上段神經(jīng)因而向......（本文共 289 字）     [閱讀本文] >>