Using maligna nt transection ratio ( -1s ) as diagnostic threshold, the sensitivity , specificity and accuracy were 84.85% , 88.89% and 85.71% , respectiv ely.

• 以恶性组横断层T/N值 x -1s为诊断阈值 ；其诊断灵敏度、特异度、准确性分别为 84.；85%25、88