烟雾病侧枝循环的MRI表现

MRI manifestation of collateral circulation in moyamoya disease

目的:探讨烟雾病(MMD)侧枝循环的类型及其MRI表现。方法:回顾分析了16例成年MMD患者的MRI和MRA表现。MRI至少包括横断面T1WI、T2WI;16例行MRA检查,采用3D-TOF法。结果:MMD侧枝循环的来源主要有3条途径:颅底烟雾血管、来自大脑后动脉(PCA)的柔脑膜侧枝血管以及来自颈外动脉(ECA)系统穿过硬脑膜的侧枝血管。5例PCA侧枝循环表现正常,7例增加,6例减少;13例ECA侧枝血管表现正常(单侧12例),15例增加(其中双侧3例)。4例少量颅底烟雾血管,7例大量烟雾血管,5例减少、闭塞。MRA和T2WI均可显示颅底烟雾血管,PCA和ECA侧枝血管仅在MRA满意显示。结论:MRI和MRA是诊断MMD患者侧枝循环十分有用的工具。

Objective： To evaluate MRI characteristics of collateral vessels in moyamoya disease（MMD）. Method： Both MRI and MRA findings in 16 adult cases with MMD were analyzed retrospectively. Axial T1WI and T2WI were operated for MRI, while 3D-TOF was used for MRA. Results： Three main pathways of collateral circulation from skull base, PCA and ECA in MMD patients were found. Five cases of collateral networks from PCA demonstrated normal, while 7 patients manifested increased, 6 cases were decreased; 13 patients of collateral vessels from ECA presented normal, but 15 cases were increased; 4 cases of skull base moyamoya vessels were slightly increased, 5 patients apparently increased and 7 cases decreased respectively. Skull base moyamoya vessels were displayed well on both MRA and T2WI images, while only on MRA images could demonstrate PCA and ECA vessels. Conclusion： Both MRI and MRA are effective ways to demonstrate collateral circulation in MMD patients.