Pre-hepatic type the portal vein trunk itself obstruction Congenital deformity: obliteration, stenosis 先天性畸形:闭塞、狭窄 > Thrombosis: portal vein thrombosis, splenic vein thrombosis. ect 血栓形成:门静脉、脾静脉 >Infection: Tropical splenomegaly, ect 感染:热带巨脾综合症 Trauma: arterio-venous fistula. ect 创伤:动静脉瘘• the portal vein trunk itself obstruction. ➢Congenital deformity: obliteration, stenosis 先天性畸形：闭塞、狭窄 ➢Thrombosis: portal vein thrombosis, splenic vein thrombosis, ect 血栓形成：门静脉、脾静脉 ➢Infection: Tropical splenomegaly, ect 感染：热带巨脾综合症 ➢Trauma: arterio-venous fistula, ect 创伤：动静脉瘘 Pre-hepatic type