概念脑水肿系指各种脑病及全身性疾病所引起的脑组织细胞外、或细胞内的水份异常增多,从而导致脑体积增大。通常,细胞内水肿与细胞外水肿常并存,尤其是在脑水肿发展的后期,但可以其中之一为主,而纯粹的细胞内水肿或细胞外水肿则少见。早在1905年,有人划分为脑水肿和脑肿胀:脑水肿亦称“湿脑”,为血管周围的液体增多,继之细胞外间隙也积液,脑组织柔软, The concept of cerebral edema refers to a variety of brain diseases and systemic diseases caused by extracellular brain cells, or abnormal increase in intracellular water, resulting in increased brain volume. In general, intracellular edema and extracellular edema often co-exist, especially in the late development of cerebral edema, but one of the main, and pure intracellular edema or extracellular edema is rare. As early as 1905, it was divided into brain edema and brain swelling: cerebral edema, also known as “wet brain” for the fluid around the blood vessels increased, followed by the extracellular space also effusion, brain tissue soft,