一般认为CT瘤周低密度区是脑水肿。为阐明CT瘤周低密度区的本质,本文分析了2例星形细胞瘤CT瘤周低密度区和瘤中央区标本的微结构变化。发现 CT 瘤周低密度区标本内有间变的星形细胞,间质疏松。故作者认为CT瘤周低密度区是肿瘤的实际范围,伴有水肿变化。此外,本文对CT瘤周低密度区的成因和脑水肿的发病机制进行了探讨。 Generally believed that CT low-density peritumor area is cerebral edema. In order to elucidate the essence of CT low-density peritumor area, we analyzed the microstructural changes of two specimens of astrocytoma in the peritumoral low-density area and in the central area of ​​the tumor. Found in CT low-density tumor peritubular interstitial astrocytes, interstitial loose. Therefore, the authors believe that CT low-density peritumor area is the actual scope of the tumor, accompanied by changes in edema. In addition, the pathogenesis of CT low density region and cerebral edema were discussed in this paper.