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Neuroradiology |
1 From the Department of Radiology, Kumamoto University School of Medicine, 1-1-1, Honjo, Kumamoto City, 860 Japan (Y.K., M.T.); the Department of Radiology, School of Medicine, Fujita Health University, Fujita, Japan (K.K., Y.O.); the Department of Radiology, Faculty of Medicine, Kyushu University, Fukuoka, Japan (K.H.); the Department of Radiology, Nagasaki University School of Medicine, Nagasaki, Japan (M.O.); the Department of Radiology, Fukuoka University School of Medicine, Fukuoka, Japan (H.U.); the Department of Radiology, Kurume University School of Medicine, Kurume, Japan (T.A.); and the Department of Radiology, National Cardiovascular Center, Osaka, Japan (S.I.). From the 1997 RSNA scientific assembly. Received January 22, 1998; revision requested March 6; final revision received August 31; accepted October 26. Address reprint requests to Y.K.
PURPOSE: To assess the diagnostic accuracy of three-dimensional (3D) computed tomographic (CT) angiography for intracranial aneurysms.
MATERIALS AND METHODS: The 3D CT angiograms obtained in 49 patients with or without intracranial aneurysms were evaluated by four blinded observers. Results were compared with findings at conventional angiography or surgery. A volume-rendering method was used, and 13 images obtained in different directions were reviewed in each study. The diameter of aneurysms was divided into four sizes: large, greater than 13 mm; medium, 5–12 mm; small, 3–4 mm; and very small, less than 3 mm. Results were also evaluated by means of receiver operating characteristic analysis.
RESULTS: At conventional angiography, 47 aneurysms, including 14 less than 3 mm, were depicted in 35 patients. The mean sensitivity of CT angiography for very small aneurysms was 64%; small, 83%; medium, 95%; and large, 100%. Some very small aneurysms that were not depicted at conventional angiography were depicted at CT angiography, and one was proved at surgery.
CONCLUSION: CT angiography has good sensitivity for depiction of intracranial aneurysms 3 mm or larger and relatively good sensitivity for aneurysms less than 3 mm. CT angiography may be a noninvasive technique for detection of asymptomatic unruptured or ruptured aneurysms.
Index terms: Aneurysm, CT, 17.12115, 17.12116, 17.12117, 17.73 • Aneurysm, intracranial, 17.73 • Aneurysm, MR, 17.12142, 17.73 • Cerebral blood vessels, CT, 17.12115, 17.12116, 17.12117 • Cerebral blood vessels, MR, 17.12142 • Computed tomography (CT), three-dimensional, 17.12117
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