外部性脑积水 (Ｅｘｔｅｒｎａｌｈｙｄｒｏｃｅｐｈｌｕｓ,ＥＨ)是发生于婴幼儿的一种良性自愈性疾病。自ＣＴ问世后 ,国外文献已有大量报告。其中部分病例常被误诊为脑萎缩或硬膜下积液 ,导致治疗不当。自1 994年 1 0月～ 1 998年 1 0月 ,我科收治外部性脑积水 46例 ,报告如 External Hydrocephus (EH) is a benign and self-healing disease that occurs in infants and young children. Since the advent of CT, foreign literature has been a large number of reports. Some cases are often misdiagnosed as cerebral atrophy or subdural effusion, resulting in improper treatment. From January 1994 to January 1998 1 0 months, our department treated 46 cases of external hydrocephalus, reported as