Normal marrow conversion(正常骨髓转换)

The normal progression of marrow conversion is depicted in this diagram.

Discussion

Marrow conversion throughout development occurs in a predictable pattern and should not be confused with pathology. This usually occurs in a bilaterally symmetric fashion, and occurs earlier more distally and progresses proximally according to the general principles depicted in the diagram. 

讨论：

骨髓转换的整个过程中是可预测的，不应与病理性病变相混淆。 骨髓转换通常是双侧对称，并且如上图所示通常是由远端向近端依次转换。