论外部性脑积水的临床和CT诊断

随医学影像学的发展，本病已非少见疾病，笔者就所收集的８０例，对本病的某些问题作进一步讨论本病的ＣＴ诊断，国内外尚无统一标准。额顶区蛛网膜下腔扩大作为本病主要诊断依据，暂定为６ｍｍ，作为诊断参考，正确认识本病的重要意义在于鉴别于脑萎缩，以及硬膜下积液，与文献材料一致，本病以原发性者居多（６７／８０），而继发性者，本组病例中以化脓性脑膜炎为多见。强调对本病的诊断，不能以有无头围增大作为主要诊断依据，本

Clinical-CT of External Hydrocephalus

The main diagnostic clue of CT scanning is the enlargement of subarachnoid space, hasal cisterns and anterior cerebral fissure. Because there is no exact extense in CT scanning, here 6 mm is defined.It's triportant to differentiate this condition from cerebral atrophy and subdural fluid accumulation. identical with other studies, most of this desease are of primary, and of secondary is purulent menogitis.Whether the head circumference is increased or not, it would not be the clue of diagnosis is that needs to be emphasyed.Somethimes family history and dysplasia of cramocerebral were coexist.By following up it was evidential that this desease can be self limited.