T_2*加权血管成像与磁共振增强在脑血管畸形诊断的应用价值

Diagnostic valne of T_2*Weighted Angiography in intracranial vascular malformations

目的:探讨T2*加权血管成像(T2*Weighted Angiography,SWAN)与磁共振增强对脑血管畸形的诊断价值。方法:回顾性研究45例临床确诊脑血管畸形患者的MR常规、增强与SWAN表现,比较病变的显示情况。结果:SWAN和增强MR均能显示静脉畸形特征性"海蛇头"样改变;海绵状血管瘤SWAN呈结节状低信号,增强后无或轻度强化。毛细血管扩张症SWAN呈斑点状低信号,增强MR表现为模糊晕状或毛刷样增强,中央可见点状强化静脉,SWAN能显示其反复出血及海绵状血管瘤形成。结论:SWAN联合增强检查对脑血管畸形尤其是静脉畸形、海绵状血管瘤、混合型血管畸形的诊断,提供重要价值信息。

Objective:To probe the diagnostic value of T2* Weighted Angiography(SWAN) in intracranial vascular malformations.Methods:The conventional MR,contrast enhancement MR and SWAN features of 45 patients with intracranial vascular malformations proved by clinical and DSA were studied retrospectively.Results:Developmental venous anomalies(DVAs) showed characteristic 'medusa head' on enhancement MR and SWAN.Cavernous hemangioma displayed hypointense on SWAN and no or slight enhancement after Gd-DTPA intravenous injection.Capillary telangiectasias demonstrated an area of mild vague enhancement with typical lacy or brush shape,without mass effect.Among the lesion,a enhancement vein could be seen.Recurrent bleeding of capillary telangiectasias and cavernous hemangioma showed hypointense on SWAN.Conclusion:The sensitivity of SWAN has very great value of diagnosis in assigning the intracranial vascular malformation,such as cavernous hemangioma,developmental venous anomalies,and capillary telangiectasias.