患者 ,女 ,2 5岁 ,因患脑瘤住入职工医院。主诉 :发作性头晕、恶心、呕吐 2 0天。现病史 :2 0天前无明显诱因突发头晕、目眩、视物摇晃、走路不稳 ,伴恶心呕吐 ,呕吐有时为喷射状 ,为胃内容物 ,无鲜血及咖啡样物 ,眩晕与头位置有关 ,低头及卧位时加重 ,立位时减轻 ,同时感左下 Patients, female, 25 years old, admitted to the hospital due to brain tumor hospital. Chief Complaint: Paroxysmal dizziness, nausea, vomiting 20 days. Current history: 20 days ago, no obvious incentive Sudden dizziness, dizziness, blurred vision, walking instability, with nausea and vomiting, vomiting and sometimes jet, stomach contents, no blood and coffee-like objects, dizziness and head position Relevant, bowed and lying position increased, standing ease, while the lower left