Small, Asymptomatic, Unruptured Intracranial Aneurysm Found by three-dimensional CT Angiography

由三度空間電腦斷層血管攝影發現小的、無症狀且未破裂的顱內動脈瘤

黃及人(Chi-Jen Huang) ； 廖達興(Ta-Hsing Liao) ； 楊之東(Chih-Dong Yang)

《中華放射線醫學雜誌》 33卷1期 (2008/03) Pp. 17-22

摘要

很多無症狀，未破裂的顱內動脈瘤在健康檢查時，被核磁共振血管攝影或電腦斷層血管攝影發現。未破裂顱內動脈瘤國際性研究(ISUIA)強調，對於這類病人，如果沒有蜘蛛膜下腔出血的病史，被發現時動脈瘤的大小是決定它們是否會破裂的最重要因子。我們採用未破裂顱內動脈瘤國際性研究的標準，利用三度空間電腦斷層血管攝影(3-D CTA)來測量未破裂顱內動脈瘤的大小及形狀特徵。總共有二十位病人及二十二個未破裂顱內動脈瘤被發現，其中八個動脈瘤小於兩毫米，二個動脈瘤等於兩毫米，且所有病人都小於六毫米。我們同時使用三度空間電腦斷層血管攝影影像及二度空間電腦斷層影像，來確認動脈瘤的大小。我們認為三度空間電腦斷層血管攝影在測量未破裂顱內動脈瘤的大小及形狀特徵上有很好的品質，甚至對於小於兩毫米的動脈瘤也很準確。

並列摘要

Many asymptomatic, unruptured intracranial aneurysms (UIAs) are found by MR angiography or CT angiography during the physical checkup. The International Study of Unruptured Intracranial Aneurysms (ISUIA) emphasize that among patients with unruptured aneurysms and no history of subarachnoid hemorrhage, aneurismal size at the time of discovery is the most important variable determining the risk of future rupture. We use three-dimensional CT angiography (3-D CTA) to measure the size and morphological characteristics of the aneurysm, according to the standards of ISUIA. Twenty two UIAs were found in 20 patients; 8 aneurysms were smaller than 2 mm, 2 aneurysms were 2 mm and no one was larger than 6mm. The sizes of all UIAs were rechecked by both volume rendering 3-D CTA and post-contrast 2-D reformatted CT images; the measured diameter is almost the same by both methods. We find 3-D CTA has a good quality to measure the size and morphological characteristics of the aneurysm, even in aneurysm smaller than 2 mm.