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脑外脑积水是婴儿常见的良性自限性疾病。其主要ＣＴ表现为：１、两侧额顶部蛛网膜下腔增宽；２、大脑纵裂的前半部增宽；３、两侧额顶部脑皮质沟回增深、加宽；４、基底池扩大；５、脑室不扩张或仅有轻度扩张。脑萎缩的主要ＣＴ表现为脑皮质沟回增深、加宽，伴有脑室扩张。但脑萎缩的脑皮质沟回增深、加宽是整个大脑皮质，而不只局限于两侧额顶叶，并且脑萎缩没有两侧额顶部蛛网膜下腔增宽。依据上述ＣＴ表现可容易区别脑外脑积水与脑萎缩。
Extracerebral hydrocephalus is a common benign self-limiting disease in infants. The main CT manifestations are: 1, both sides of the amount of the top of the subarachnoid widened; 2, the first half of the brain widened widened; 3, on both sides of the top of the cerebral cortex furrow deepening, widening; 4, the basal pool Expand; 5, ventricular dilatation or only mild expansion. Cerebral atrophy of the main CT manifestations of cerebral cortex deepening, widening, accompanied by ventricular dilatation. However, cerebral atrophy of cerebral atrophy furrow deepened, broadening of the entire cerebral cortex, not only confined to the frontal lobes on both sides, and no atrophy on both sides of the top of the subarachnoid space widened. Based on the above CT performance can be easily distinguished from cerebral hydrocephalus and cerebral atrophy.