枕骨基底部骨松质发育不全的影像解剖

An imaging anatomy of maldeveloped cancellous bone in the occipital basis

目的：明确枕骨基底部低密度影的形成机理及其与舌下神经管的关系。方法：采用４０侧矢状切正常成人颅的横切面标本和８４例在门诊行颅底扫描者的正常ＣＴ片。结果：枕骨基底部骨松质发育不良区及其影像表现以椭圆形为常见。在骨标本上测得骨松质发育不良区长９．５±２．９ｍｍ，宽６．４±３．１ｍｍ，高５．４±１．８ｍｍ。指出了在ＣＴ图像上区分枕骨基底部发育不良影和舌下神经管影的方法。结论：枕骨基底部低密度影系枕骨基底部骨松质局部发育不良所致。

bjective:To understand the formation of lowdensity occipital basis transparent image and its relation to hypoglossal canal.Methods:CT transparent image of the occipital basis was studied on 40 sides of sagittalcut adult skull specimens (male 20, female 20) and 84 normal skulls (male 50,female 34)which was combined with cross section of the occipital basis. Results:The rate of maldeveloped cancellous bone in the occipital basis is 42.5%.The shape of the maldeveloped part is mainly elliptical with a size about 9.5±2.9 mm to 6.4±3.1 mm to 5.4±1.8 mm.Conclusion:Lowdensity transparent image in the occipital basis is due to maldeveloped canellous bone in the region.