Leukoencephalopathy-Spondyloepimetaphyseal Dysplasia Syndrome, also known as hypomyelination-spondyloepimetaphyseal dysplasia syndrome, is related to spondyloepimetaphyseal dysplasia, strudwick type and spondyloepimetaphyseal dysplasia, x-linked, with hypomyelinating leukodystrophy. An important gene associated with Leukoencephalopathy-Spondyloepimetaphyseal Dysplasia Syndrome is AIFM1 (Apoptosis Inducing Factor Mitochondria Associated 1). Affiliated tissues include bone and monocytes, and related phenotypes are leukoencephalopathy and metaphyseal chondrodysplasia