Diagnostic value of digital subtraction CT angiography in small intracranial aneurysms / 实用放射学杂志

ABSTRACT

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.