白血病前期(简称白前)和骨髓增生异常综合征(简称MDS)都是骨髓多能干细胞水平的病变,两者都存在无效性造血,也都可以发展为白血病.但MDS是描述性的泛称,它不仅包括白前,还包括一组更多的疾病,其中各类疾患演变为白血病的发生率各不相同.白前则大多属于回顾性诊断,在发生白血病之前很难确诊,其后也未必发生白血病,因此白前的命名取义似嫌不当.MDS乃按骨髓造血异常而命名,并未指明一定发生白血病或其它定向性疾患,既符合实际 Pre-leukemia and myelodysplastic syndrome (referred to as MDS) are bone marrow pluripotent stem cell level lesions, both of which have ineffective hematopoietic, but also can develop into leukemia.But MDS is a descriptive general, It includes not only white, but also includes a group of more diseases, including various types of disease evolved into the incidence of leukemia varies .Before most of the white is a retrospective diagnosis, difficult to confirm before the occurrence of leukemia, then not necessarily The occurrence of leukemia, so the white naming of the former seems inappropriate.MDS is named according to abnormal bone marrow hematopoiesis, did not indicate the occurrence of leukemia or other directional disorders, both in line with the actual