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脑内微出血(microbleeds,MBs)定义为梯度回波MRI(GE-MRI)检出的均匀一致、圆形T2信号消失区,直径2～5 mm,周围无水肿。陈旧性MBs可能与易于出血的微血管病相关。
Microbleeds (MBs) in the brain are defined as uniform, circular T2-signal disappearance areas detected by gradient echo MRI (GE-MRI), with a diameter of 2 to 5 mm with no surrounding edema. Old MBs may be associated with microvascular disease that is prone to bleeding.