Olsen W L, Brant-Zawadzki M, Hodes J, Norman D, Newton T H
Radiology. 1987 May;163(2):431-5. doi: 10.1148/radiology.163.2.3562822.
Fifteen patients with giant intracranial aneurysms were examined with magnetic resonance (MR) imaging, computed tomography (CT), and angiography. MR imaging revealed a rounded extraaxial mass with evidence of intraluminal blood flow in 12 of the 15 cases. Signal void within the lumen was seen in all 12 of these cases. Other flow effects, such as even-echo rephasing, were seen in some cases. Complete thrombosis was seen in three giant aneurysms in which high signal intensity on T1- and T2-weighted images filled the lumen, and no flow effects were seen. Partial thrombosis was detected in four aneurysms as persistent areas of medium to high signal intensity within the lumen on T1- and T2-weighted images. In five cases, the cause of the intraluminal signal that was present was difficult to determine. The ability of MR to indicate flow within the lumen in 12 of 15 cases provided for greater diagnostic confidence than with CT, which was strongly suggestive of an extraaxial tumor in nine patients. Calcification of the wall of the aneurysm was better detected with CT.
对15例巨大颅内动脉瘤患者进行了磁共振成像（MR）、计算机断层扫描（CT）及血管造影检查。MR成像显示，15例中有12例存在圆形轴外肿块，伴有管腔内血流迹象。这12例中均可见管腔内信号缺失。部分病例还可见其他血流效应，如偶数回波重聚。3例巨大动脉瘤出现完全血栓形成，其管腔在T1加权像和T2加权像上呈高信号强度，未见血流效应。4例动脉瘤检测到部分血栓形成，表现为T1加权像和T2加权像上管腔内持续存在的中等至高信号强度区域。5例中，管腔内信号出现的原因难以确定。MR在15例中有12例能够显示管腔内血流，比CT更有助于提高诊断信心，CT强烈提示9例患者为轴外肿瘤。CT对动脉瘤壁钙化的检测效果更佳。
