text_1: 随后 发现 患者 瞳孔 固定 和 扩大 ; 紧急 头颅 CT 显示 左侧 小脑 半球 脑 实质 内 大出血 , 占位 挤压 脑干 , 第四 脑室 , 以及 小脑 幕切迹 疝 和 小脑 扁桃体 疝 .
  
text_2: subsequently , the patient was noted to have fixed and dilated pupils ; an urgent CT scan of the head showed a large intraparenchymal hemorrhage in the left cerebellar hemisphere with mass effect on the brain stem and fourth ventricle , as well as transtentorial and tonsillar herniation .
  