Methods: 79 eases who had no pupil change and had obvious massing effect as study objects. 100 volunteers without any cranial symptoms and signs as contrast objects.

• 方法：选取79例无瞳孔改变的偏侧占位效应明显的患者与100名无明显颅脑症状及体征的志愿者作为对照，研究诊断早期小脑幕疝的标准及临床价值。