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目的：观察和测量国人正常小脑延髓池的ＣＴ形态、大小正常值，为影像学诊断提供依据。方法：观察随机抽取的５００例正常人ＣＴ扫描片各个层面小脑延髓池的形态，测量其最大层面的前后径、横径和高度，并观察小脑延髓池内小脑镰的形态。结果：小脑延髓池形态大致可以分成六种形态，其中圆形占１２．１％，半圆形１２．８％，三角形２０．７％，品字形２６．１％，四边形１．３％，不规则形２７．０％。各径线的正常值：前后径０～１５ｍｍ；横径０～３０ｍｍ，纵径０～４１．６ｍｍ。小脑镰的出现率为４２．７％。结论：小脑延髓池的形态取决于枕内嵴的高度，大小取决于枕骨和小脑半球的发育。年龄、性别对其形态和大小都有影响。当小脑延髓池的前后径＞１５ｍｍ，横径＞３０ｍｍ，纵径＞４２ｍｍ，可诊断为巨型枕大池
OBJECTIVE: To observe and measure the CT shape and normal size of normal cerebellar cistern of Chinese people, and provide evidence for imaging diagnosis. Methods: Morphology of cisterna magna in each layer of 500 normal subjects were observed. The anteroposterior diameter, transverse diameter and height at the maximal level were measured. The morphology of cerebellar falx was observed in cerebellar cistern. Results: The morphology of cerebellar cistern can be divided into six forms, of which 12.1% are round, 12.8% are semicircular, 20.7% are triangular, 26.1% are glyphs and 1.3% are tetragonal. Rule form 27.0%. The normal value of each line: anteroposterior diameter 0 ~ 15mm; transverse diameter 0 ~ 30mm, longitudinal diameter 0 ~ 41.6mm. The incidence of cerebellar sickle was 42.7%. CONCLUSIONS: The morphology of the cerebellar cistern is dependent on the height of the occipital crest and depends on the development of the occipital and cerebellar hemispheres. Age and gender have an impact on their shape and size. When the cerebellar cistern pool anteroposterior diameter> 15mm, diameter> 30mm, longitudinal diameter> 42mm, can be diagnosed as giant pillow pool