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等密度硬膜下血肿（简称ISDH）常规CT诊断较为困难，易于漏诊、误诊向延误治疗。增强扫描有助于定位、定量及定性诊断、本文报道经手术证实的45例慢性等密度硬膜下血肿，其CT诊断特征表现有；（1）脑室系统向对侧移位，伴有侧脑沟消失和病侧蛛网膜下腔闭塞。（2）脑灰白质向内移位。（3）中线结构移位病侧脑室受压移位及对侧侧脑室的轻度扩大。
Isdual hematoma (ISDH) routine CT diagnosis is more difficult, easy to missed diagnosis, misdiagnosis to delay treatment. Enhanced scanning helps to locate, quantitative and qualitative diagnosis, reported in this paper, 45 cases confirmed by surgery of chronic equal density subdural hematoma, the CT diagnostic features are: (1) ventricular system to the contralateral shift, accompanied by the lateral brain Ditch disappeared and the side of the subarachnoid occlusion. (2) brain gray matter shift inward. (3) midline structural displacement of the lateral ventricle compression displacement and contralateral ventricle mild expansion.