脑出血扩散加权磁共振表现

Diffusion-weighted MR imaging of intracerebral hemorrhage

目的观察脑出血不同时期扩散加权(DWI)磁共振表现。方法根据患者发病时间与磁共振检查间隔时间,将22例脑出血患者分为5组,其中超急性期3例;急性期3例;亚急性早期5例;亚急性晚期7例;慢性期4例。回顾性分析各组患者的常规及扩散加权磁共振表现。结果DWI显示超急性期及亚急性晚期两组血肿呈高信号;急性期、亚急性早期及慢性期血肿呈低信号。超急性期血肿边缘可见低信号环;超急性期、急性期及亚急性早期血肿周边可见高信号环。结论脑血肿各时期DWI表现有其独特的特点。DWI是鉴别脑血肿和脑梗死的重要手段。

Objective To observe the DWI features of intracerebral hemorrhage （ICH） at different evolving stages. Methods Twenty two patients with ICH underwent DWL According to the time interval between symptom onset and initial MRI, five stages were categorized, i. e. hyperacute （n=3） ; acute （n=3）, early subacute （n=5）, late subacute （n=7） and chronic （n=4）. T1 and T2 weighted imaging of these cases were reviewed. Results Hematomas were hyperintense at the hyperacute and late subacute stages, and hypointense at the acute, early subacute and chronic stages on DWI. Focal hypointensity was observed invariably within a hyperacute hematoma. At the hyperacute, acute and early subacute stages, hyperintense rims surrounding the hematoma were present. Conclusion ICH has different characteristic DWI features at different stages. DWI can be helpful to the differentiation of hemorrhage from ischemia.