患儿男,4.5岁.因1月前无明显诱因下突然全身抽搐1次伴意识丧失,持续约20分钟,在当地医院予安定5mg肌注后惊止,当时无发热、头痛、呕吐,治疗3天(具体不详)后出院.回家后即开始出现阵发性剧烈头痛,持续几分钟,间歇1～2小时,伴频繁喷射样呕吐.在外院行腰穿,脑脊液示白细胞2560×10~6/L,嗜酸性细胞占0.56,糖2.8mmol/L,蛋白lg/L.头颅CT示右额叶lcm左右囊肿,拟“头痛待查:脑脓肿?”在外院予抗炎、能量、降颅压等治疗后症状无明显缓解转来本院,复查头颅CT仍有右额叶低密度灶,追问病史患儿病前7～8月曾有吃生石蟹史.体检:T38.4℃,神志清,痛苦貌,头颅五官无畸型,皮下未见结节,心肺腹检查未见异常.颈稍抵抗,巴彬氏征(+),血白细胞11.6×10~9/L,淋巴0.43,中性0.57.胸片、心电图正常.肝 Child, male, 4.5 years old. Sudden convulsions of the whole body without convulsion were associated with unconsciousness for 1 to 20 minutes and stopped at a local hospital for 5 mg intramuscular injection. There was no fever, headache, vomiting and treatment 3 days (specific unknown) after discharge.Has returned after the onset of severe paroxysmal headache, continued for a few minutes, an interval of 1 to 2 hours, with frequent jet-like vomiting.In the outer line lumbar puncture, cerebrospinal fluid showed white blood cells 2560 × 10 ~ 6 / L, eosinophils accounted for 0.56, sugar 2.8mmol / L, protein lg / L. Head CT showed right frontal lobe about lcm cysts, to be “headache pending investigation: brain abscess?” Outside the hospital to anti-inflammatory, Pressure and other symptoms no significant relief transferred to our hospital, review head CT still have right frontal lobe low-density lesions, history of children asked before going there in July to August had a history of eating raw crab. Physical examination: T38.4 ℃, mind Clear, painful appearance, facial features no malformations, no nodules in the skin, no abnormal cardiopulmonary abdominal examination .Slightly resistance to the neck, Palin’s sign (+), white blood cells 11.6 × 10 ~ 9 / L, lymph 0.43, 0.57 chest X-ray, normal liver