In normal people, there is yellow and red bone marrow in the bone marrow cavity, with the understanding that the yellow marrow is the spare bone marrow and normally has no hematopoietic function. Only in the case of apparently severe hemorrhagic diseases, or other wasting diseases, which require the involvement of hematopoietic functions, the symptoms of bone marrow conversion may appear. The findings are reflected in the MRI with no specific sclerosis, no cystic changes in the bones, and no other changes suggestive of a bone tumor. The presence of bone marrow conversion alone, with no other specific symptoms of disease, does not require specific treatment. If there are other symptoms, relevant tests can be performed to clarify the cause of bone marrow conversion. Did not find the cause of the disease diagnosis, no symptoms, can be regularly reviewed, do not worry too much about this problem, is not a disease of obvious significance.