许多骨髓增生综合症如:真性红细胞增多症、原发性出血性血小板增多症、慢性粒细胞白血病、不明原因的骨髓痨,特别是原发性出血性血小板增多症和不明原因的骨髓痨脾切除后,血小板数可超过1百万/立方毫米以上。通常伴发血栓形成和出血。血栓形成常累及大血管如:肠系膜动脉、脾动脉或静脉以及肝静脉并可引起致死性并发症。出血,特别是消化 Many myelodysplastic syndromes such as polycythemia vera, essential hemorrhagic thrombocythemia, chronic myeloid leukemia, unexplained myelodysplastic syndromes, especially idiopathic hemorrhagic thrombocythemia and unexplained bone marrow splenic resection After the platelet count can exceed 1 million / cubic millimeter above. Usually associated with thrombosis and bleeding. Thrombosis often involves large blood vessels such as: mesenteric artery, splenic artery or vein and hepatic vein and can cause fatal complications. Bleeding, especially digestion