Rhizomelic Skeletal Dysplasia with or Without Pelger-Huet Anomaly, also known as regressive spondylometaphyseal dysplasia, is related to pelger-huet anomaly and spondyloepimetaphyseal dysplasia, strudwick type. An important gene associated with Rhizomelic Skeletal Dysplasia with or Without Pelger-Huet Anomaly is LBR (Lamin B Receptor). Affiliated tissues include bone and neutrophil, and related phenotypes are hyperlordosis and genu valgum