正常鞍区冠状面CT断层解剖学研究

SECTONAL ANATOMY OF NORMAL SELLA TURCICA REGION ON THE CORONAL CT IMAGING

目的 研究正常成人鞍区冠状面 CT断层解剖学特征。 方法 利用全身 CT设备 ,对 16 7例正常成人进行了鞍区冠状面薄层 CT增强扫描 ,层厚 1.5～ 2 mm。 结果 正常垂体高度为 2 .6～ 8.4m m,平均 4.6±2 .1mm ,宽度为 8～ 2 1m m,平均 13.8± 4.1m m ,5 0岁以后垂体高度稍有降低 ;垂体上缘形态以凹陷型居多 (43% )、平坦型次之 (36 % ) ,隆起型较少 (2 1% ) ;2 6 %正常垂体柄有轻度倾斜 ;海绵窦大小、形态变化较大 ,增强后其密度高于垂体 ;鞍底有 5 1%呈凹陷型 ,45 %呈平坦型 ,4%呈隆起型 ,有 5 0例 (30 % )正常鞍底骨质变薄、密度减低。 结论 冠状面薄层 CT扫描可以清晰显示鞍区的解剖结构 ,正常鞍区解剖变异较大 ,须综合观察才能做出正确判断。

Objective\ To study the appearances of sectional anatomy of normal sella turcica region on the coronal CT imaging. Methods Normal sella turcia region of 167 cases were examined with whole body CT equipment. The thin contrast CT scan was performed on coronal section, with the thinness of 1 5 2 0mm. Results The average height of the hypophysis(pituitary gland) was 4 6±2 1mm, with the range between 2 6 8 4mm.The length was 13 8±4 1mm. The height of the hypophysis was slightly decreased after the age over 50 years old. The shape of superior surface of the hypophysis usually was concave(43%), flat(35%) or convax(21%). The infundibulum may be slightly off midline in 26% normal cases. The shape and size of cavernous sinus usually were variable, the density of cavernous sinus was higher than that of the hypophysis on contrast enhancement CT imaging. Sellar floor was concave in 51% cases, and flat in 45% cases, but convax in only 4% cases. Thinning and lower density of normal sellar floor can be seen in 50(3%) cases. Conclusions Coronal thin CT scan is an effective model in displaying the sectional anatomy of sella turcica region. The form of the normal sella turcica is often variant. In order to decide a correct diagnose,all the signs of the sella turcica region(include the shape, size, densities of the hypophysis, infundibulum and sellar floors) ought to be observed.