发生过程中内皮细胞由厚变薄，血管平均截面积逐渐减小，管腔的体密度增大；

During development, the endothelial cells thinned , the average profile area of the vessels reduced and the volume density of vascular lumen increased gradually.

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目的探讨直肠癌彩色血流平均密度(MCVD)与TNM分期、微血管密度(MVD)的关系。

Objective To explore the relationship of the mean color vessels density (MCVD) with TNM stage and pathologic microvessel density (MVD) in rectal cancers.

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对照组第一次治疗前与第一次治疗后8周比较，平均血管密度和平均血管直径无统计学差异。

In control group, there is no statistical difference in terms of the mean vessel density and diameter of port wine stain between 8 weeks after and before the first treatment.

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