婴儿外部性脑积水（ExternalHrdrocephalusininfant，EH）是发生在婴儿期的一种良性自愈性疾病［1］，是非梗阻性脑积水的一种特殊类型。由于我们对此病缺乏认识，自1992年则月CT投入使用至1994年1月，共有23例患儿行CT检查后误诊为硬膜下积液或脑萎缩，现做分析，以进一步提高 External Hrdrocephalus in Infant (EH) is a benign, self-healing disease that occurs in infancy [1] and is a special type of non-obstructive hydrocephalus. Because of our lack of understanding of the disease, CT was put into use from January 1992 to January 1994, a total of 23 children misdiagnosed as subdural effusion or brain atrophy after CT examination, to do further analysis