病态造血改变是骨髓增生异常综合征(MDS)的重要形态学特征。但近来Steensma等[1]报道了少数无病态造血改变的MDS。我们新近也遇到1例MDS,患者有两系的外周血细胞计数减少,经详细的形态学观察和深入的分子细胞遗传学分析证 Morbid hematopoietic changes are important morphological features of myelodysplastic syndrome (MDS). But recently Steensma et al [1] reported a small number of non-pathological changes in MDS. We have recently encountered a case of MDS, patients with two lines of peripheral blood cell count decreased by the detailed morphological observation and in-depth molecular cytogenetic analysis card