1　骨髓移植后弥漫性肺泡出血的病因　　骨髓移植 (ＢＭＴ)是将别人或自己的骨髓移植到体内 ,其本质是移植造血干细胞。由于干细胞有不断自我复制和分化为成熟血细胞 (红、白细胞 ,巨核细胞 )及免疫活性细胞的能力 ,故移植后可重建受者的骨髓造血和修复人体淋巴组织与单核细胞? 1, the cause of diffuse alveolar hemorrhage after bone marrow transplantation Bone marrow transplantation (BMT) is to transplant other people or their own bone marrow into the body, the essence is the transplantation of hematopoietic stem cells. Because of the ability of stem cells to self-replicate and differentiate into mature blood cells (red, white blood cells, megakaryocytes) and immunocompetent cells, bone marrow hematopoiesis can be reconstructed after transplantation and repair of human lymphoid tissue and mononuclear cells.