Results: The sensitivity, specificity and positive predictive value of CT and 3DCT are all higher than X-ray plain film.There has little mistaken diagnosis and omissible diagnosis.

• 结果：X线平片、普通CT及多层螺旋CT三维成像三种方法中，后二者的灵敏度、特异度及阳性预测值均高于X线平片，漏诊较少，几乎没有误诊。