基底动脉闭塞所致急性梗死的影像学表现

Imaging Findings of Acute Infarction Caused by Basilar Artery Occlusion

目的:探讨基底动脉闭塞(BAO)所致急性梗死的影像学表现特征。方法:回顾性分析2016年1月～2018年5月我院收治的26例BAO所致急性梗死患者的资料。所有患者均有CT平扫、MRI平扫及3D-TOF MRA资料。重点分析3D-TOF显示的BAO处的CT平扫征象、MRI T1WI、T2WI及T2FLAIR征象。结果:本组BAO均由MRA明确显示,责任供血区的急性梗死在DWI上呈高信号、ADC呈低信号。CT平扫上18例显示BAO处高密度动脉征,6例显示BAO处较大范围钙化征。MRI T1WI显示BAO处高信号血管征20例,T2WI及FLAIR流空现象消失26例。结论:BAO及其所致的急性梗死可由MRA及MRI明确诊断,CT及MRI影像学上基底动脉血管征有较高的显示率,认识这些征象有助于早期诊断。

Objective: To investigate the imaging features of acute infarction caused by basilar artery occlusion(BAO). Methods: The data of 26 patients with acute infarction caused by BAO in our hospital from January 2016 to May 2018 were retrospectively analyzed. All patients underwent plain CT scan, noncontrast MRI scan and3 D-TOF MRA examinations. The plain CT images signs, MRI T1 WI, T2 WI and T2 FLAIR signs at the occlusion displayed on the 3 D-TOF were mostly analyzed. Results: The BAO in this group was clearly shown by MRA. The acute infarction in the responsible blood supply area showed high signal on DWI and low signal on ADC. 18 cases showed high density artery sign and 6 cases showed calcification sign at the occlusion on CT images. T1 WI showed 20 cases with hyper intense vascular sign at the occlusion as well as T2 WI and FLAIR showed the absence of flow void phenomenon in all the 26 cases. Conclusion: BAO and its induced acute infarction can be diagnosed by MRA and MRI. CT and MRI imaging have a high display rate of basilar arterial vasculature signs and recognition of these signs is helpful for early diagnosis.