串珠征改變多見于分水嶺腦梗死的皮質上型，是大腦前、中、后動脈的皮層支之間的供血區域梗塞，位于額中回，中央前回上部，頂上小葉和枕葉上部，還可以呈條索狀、點狀。
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.
分水嶺腦梗死（CWI）是指發生在2條或2條以上腦動脈以及深穿支和深穿支供血區域之間邊緣帶的梗死。
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.
主要發生在半球的表淺部位，可以發生在大腦半球的單側，也可以發生在大腦半球的雙側，但臨床上以單側較多見，CWI約占所有腦梗死的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.
分水嶺腦梗死常見于60歲以上的老年人，臨床癥狀和體征取決于損害的部位和程度，大腦皮層分水嶺腦梗塞常沒有任何癥狀。
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.
目前認為，低血壓和低血容量是引起CWI的最常見原因；傳統卒中危險因素，如高血壓、高脂血癥、糖尿病和心臟病均是CWI的危險因素。其發病機制包括低灌注和（或）栓子清除障礙。
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.
