IVC:MRI showed the stenosis or occlusion of suprahepatic segment of the IVC in 9 patients,of them congenital abnormality was 4 patients,thrombosis was 3 patients and compression by tumor was 2 patients.

• ( 2 )IVC:MRI显示 9例肝段 IVC狭窄和阻塞 ,其中先天性膜或分隔形成 2例 ,先天性狭窄或畸形 2例 ,血栓形成 1例 ,瘤栓形成 2例 ,外压性狭窄 2例。