摘要
目的:评价脑动脉高密度征价值。方法:总结300例疑为脑血管意外经经临床观察、CTA或MRI明确诊断的急诊平扫CT,测定和比较Willis动脉环及邻近大动脉分支与脑实质CT值。结果:大脑中动脉供血区梗死34例,基底动脉供血区梗死17例;107显示脑动脉高密度征,检出率35.7%。其中大脑中动脉高密度征(HMCAS)79例,15例脑梗死,敏感度19.0%,特异性44.1%。基底动脉高密度征(HBAS)28例,3例脑梗死,敏感度10.7%,特异性17.6%。非对称性HMCAS是早期脑梗死的可靠征象,多发生在MCA第1和第2段,发生在第2段呈“圆点征”或“破折号征”;HBAS呈“圆点征”。结论:脑动脉高密度征是脑梗死最早期和最有用的征象之一;但并不总是代表原位血栓,需严格诊断标准减少可能的假阳性。
Objective：To estimate the clinical value of hyperdense cerebral artery sign （HCAS）. Methods.. Plain CT scans of 300 emergency cases, suspected of suffering from cerebrovascular accidents, were retrospectively studied. The CT values of Willis circle and their main branches were measured and compared with those of the brain parenchyma. Results： There were 34 MCA infarctions and 17 basilar artery infarctions. Hyperdense cerebral artery sign were detected in 107 cases of the patients,the detection rate was 35.7%. In the 107 cases with HCAS,79 cases revealed hyperdense middle cerebral artery sign （HMCAS） and 15 of them developed infarction. The sensitivity rate was 19.0% and the specificity rate was 44. 1%. 28 of the cases with HCAS showed hyperdense basilar artery sign （HBAS） and 3 of them developed infarction. The sensitivity rate was 10.7% and the specificity rate was 17.6%. Asymmetrical HMCAS, presented as ＂dot＂ or ＂dash＂ signs and often found in MI and M2 segments of MCA, were reliable signs for the diagnosis of early infarction. HBAS often showed as ＂dot sign＂. Conclusion： Hyperdense cerebral artery sign was one of the earliest and most useful CT signs for the diagnosis of cerebral infarction. However,it was not always the sign representing a thrombus in situ, therefore, some more strict diagnostic criteria should be provided for the sake of preventing misdiagnoses and false positive cases.
出处
《放射学实践》
2006年第11期1118-1120,共3页
Radiologic Practice
关键词
脑动脉高密度征
体层摄影术
X线计算机
脑梗死
Hyperdense cerebral artery sign
Tomography,X-ray computed
Cerebral Infarction
