串珠征改变多见于分水岭脑梗死的皮质上型，是大脑前、中、后动脉的皮层支之间的供血区域梗塞，位于额中回，中央前回上部，顶上小叶和枕叶上部，还可以呈条索状、点状。
Beaded character change type found in the cortex of watershed cerebral infarction, is before, during and after cerebral artery infarction, cortex blood flow between the area is located in the back in the forehead, the upper, precentral gyrus and occipital lobe on the top of the upper, can also show a funicular, dot.
分水岭脑梗死（CWI）是指发生在2条或2条以上脑动脉以及深穿支和深穿支供血区域之间边缘带的梗死。
Watershed cerebral infarction (CWI) refers to the infarction of the marginal zone between two or more cerebral arteries and deep penetrating branches and deep penetrating branches.
主要发生在半球的表浅部位，可以发生在大脑半球的单侧，也可以发生在大脑半球的双侧，但临床上以单侧较多见，CWI约占所有脑梗死的10%。
Mainly in the hemisphere table shallow layers, can occur in unilateral cerebral hemisphere, can also occur in the bilateral cerebral hemisphere, but with one more see, clinical CWI accounted for about 10% of all cerebral infarction.
分水岭脑梗死常见于60岁以上的老年人，临床症状和体征取决于损害的部位和程度，大脑皮层分水岭脑梗塞常没有任何症状。
Watershed cerebral infarction is commonly seen in people over 60 years old, and clinical symptoms and signs depend on the location and extent of the lesion. Cerebral infarction in the cerebral cortex often has no symptoms.
目前认为，低血压和低血容量是引起CWI的最常见原因；传统卒中危险因素，如高血压、高脂血症、糖尿病和心脏病均是CWI的危险因素。其发病机制包括低灌注和（或）栓子清除障碍。
Currently, low blood pressure and low blood volume are the most common causes of CWI. Traditional stroke risk factors such as hypertension, hyperlipidemia, diabetes and heart disease are all risk factors for CWI. The pathogenesis includes low perfusion and/or embolization.
