[例1] 男,68岁,有高血压史。某日看书时突感眩晕伴头痛、耳鸣、呕吐、全身乏力而就诊。体检:嗜睡。血压180/90。颈有抗力。瞳孔等圆,光反射灵敏。右眼内收受限。双眼活动时有水平及垂直性粗大眼震。左鼻唇沟浅。左上肢肌张力略低,肌力弱3～4。指鼻跟膝试验欠准。腱反射右高于左。双下肢引出病理征。脑脊液血性,压力正常。拟诊蛛网膜 [Example 1] Male, 68 years old, with history of hypertension. Sudden sense of dizziness reading one day with headache, tinnitus, vomiting, malaria and treatment. Physical examination: lethargy. Blood pressure 180/90. Neck is resistant. Pupil and other round, light reflection sensitive. Right eye admissions limit. Eyes are horizontal and vertical nystagmus. Left nasolabial groove shallow. Left upper limb muscle tension is slightly lower, weak muscle 3 ~ 4. Finger nose and knee test is not allowed. Tendon reflex right above left. Both lower limbs lead to pathological signs. Cerebrospinal fluid bloody, normal pressure. Proposed arachnoid