Biondi A, Scialfa G, Scotti G
Servizio di Neuroradiologia, Ospedale Niguarda, Milano, Italy.
Neuroradiology. 1988;30(3):214-8. doi: 10.1007/BF00341831.
MR studies of 17 patients with 19 intracranial aneurysms are reviewed. All patients also underwent CT and angiography. MR has been able to visualize the aneurysms in all cases. Aneurysms present various MR appearances because of flow characteristics, thrombosis in different stages of organization, calcific and ferric deposits. Based on MR signal changes it is possible to distinguish between flow effects and histopathological components such as thrombosis. Flow patterns are complex and sometimes it is difficult to define the cause responsible for intraluminal signal. MR allows a precise definition of perilesional brain tissue and demonstrates associated lesions. Angiography remains the definitive procedure in the diagnosis of small aneurysms, but shows only that part of the lesion in continuity with the circulation. MR clearly delineates the size, the residual lumen and the extra-axial location of giant aneurysms. In completely thrombosed aneurysms, when CT suggest a tumor, MR is able to demonstrate the vascular nature of the lesion.
对17例患有19个颅内动脉瘤的患者的磁共振成像（MR）研究进行了回顾。所有患者还接受了计算机断层扫描（CT）和血管造影。在所有病例中，MR都能够显示出动脉瘤。由于血流特征、不同机化阶段的血栓形成、钙化和铁沉积，动脉瘤呈现出各种MR表现。基于MR信号变化，可以区分血流效应和组织病理学成分，如血栓形成。血流模式复杂，有时难以确定腔内信号的成因。MR可以精确界定瘤周脑组织，并显示相关病变。血管造影仍然是诊断小动脉瘤的决定性检查方法，但仅显示病变与循环系统连续的部分。MR能够清晰地勾勒出巨大动脉瘤的大小、残余管腔和轴外位置。在完全血栓形成的动脉瘤中，当CT提示为肿瘤时，MR能够显示病变的血管性质。
