颅中窝底后缘的HRCT测量及其临床价值

目的测量正常成人颅中窝底后缘相关解剖径线,探讨颅中窝底变异的诊断标准及临床意义.方法选取健康成人40例(80侧),在冠状位HRCT上测量颅中窝底后缘相关解剖径线并行统计分析.结果健康成人颅中窝底后缘深径左侧为(4.09±2.26) mm,右侧为(4.75±2.14) mm,总体为(4.42±2.21) mm,双侧比较(P=0.14)无显著统计学差异;95%可信区间0.09～8.75 mm.男性颅中窝底后缘深径(4.75±2.07) mm,女性(4.80±2.05) mm,男女比较(P=0.927)无显著统计学差异.结论 HRCT可以清晰显示颅中窝底后缘骨性解剖结构,当颅中窝底后缘深径大于8.75 mm时,规定为颅中窝底低位,应提示临床此种变异.

Measurement of the middle cranial fossa on HRCT and its clinical significance

Objective To measure the anatomical diameters of posterior rim of middle cranial fossa of healthy adults on HRCT and to evaluate diagnostic criteria and its clinical significance of the anatomical variants in middle cranial fossa.Methods The anatomical diameters of middle cranial fossa of forty (80 ears) healthy adults were measuerd on coronal HRCT images.Results The depth of left middle cranial fossa was (4.09±2.26) mm,the depth of the right middle cranial fossa was (4.75±2.14) mm,the average depth of all was (4.42±2.21) mm,no apparent difference between two sides(P=0.14) and confidence interval for 95% mean was 0.09-8.75 mm. The male was (4.75±2.05) mm,the female was (4.80±2.07) mm.There was no significant difference between the male and the female (P=0.927).Conclusion HRCT can clearly display osseous anatomical structure of middle cranial fossa and anatomic variants; it suggests as low-lying middle cranial fossa when the depth is larger than 8.75 mm,and should be mentioned as a kind of variant.