数字减影CT血管成像对颅内小动脉瘤的诊断价值

目的：评价数字减影 CT 血管成像(DSCTA)在颅内小动脉瘤诊断中的价值。方法回顾性分析92例经数字减影血管造影(DSA)或手术确诊为颅内动脉瘤患者的临床及 CT 影像资料,比较 DSCTA 和常规 CT 血管成像(CTA)2种技术对颅内动脉瘤检测的准确性。结果92例患者经证实共有102个动脉瘤,DSCTA 检出其中100个,常规 CTA 检出其中89个(χ2=8.707,P =0.003)。DSCTA 漏诊海绵窦段和床突下段动脉瘤各1例,而常规 CTA 漏诊13例床突下段及海绵窦段与颅骨紧贴<5.0 mm 的小动脉瘤。进一步将<3.0 mm 和3.0~5.0 mm 的动脉瘤合并计算,DSCTA 对检出5.0 mm 以下动脉瘤的敏感性显著高于常规CTA 技术(χ2=8.393,P =0.004)。结论DSCTA 对颅内动脉瘤诊断优于常规 CTA,尤其对颅底毗邻小动脉瘤的诊断有明显的优势,可作为筛查和诊断颅内动脉瘤的首选检查技术。

Diagnostic value of digital subtraction CT angiography in small intracranial aneurysms

Objective To evaluate the value of digital subtraction computed tomography angiography(DSCTA)in the diagnosis of intracranial small aneurysms.Methods 92 patients with intracranial aneurysms confirmed by digital subtraction angiography(DSA) or surgery were selected as the subjects of this study.Their clinical and CT imaging data were analyzed retrospectively.The diagnos-tic accuracy of DSCTA and conventional CTA for intracranial aneurysms was compared.Results A total of 102 aneurysms were con-firmed in the 92 patients,100 of them were detected by DSCTA and 89 by conventional CTA (χ2 =8.707,P =0.003).Two small aneurysms of less than 5.0 mm located respectively at the cavernous sinus and beneath the clinoid segments were missed by DSCTA, while 13 by conventional CTA.When aneurysms of less than 3.0 mm and 3.0-5.0 mm were combined with calculation,the sensi-tivity of DSCTA in detecting aneurysms of less than 5.0 mm was significantly higher than that of conventional CTA (χ2 =8.393,P =0.004).Conclusion DSCTA has more advantages than conventional CTA in the diagnosis of intracranial aneurysms,especially for the small aneurysms adjacent to the skull base.DSCTA can be used as a preferred technique in the screening and diagnosis of in-tracranial aneurysms.