<unk>  (abbreviated to SED more often than SDC) is a rare disorder of bone growth that results in dwarfism, characteristic skeletal abnormalities, and occasionally problems with vision and hearing. The name of the condition indicates that it affects the bones of the spine (spondylo-) and the ends of bones (epiphyses), and that it is present from birth<unk> l). The signs and symptoms of<unk>  are similar to, but milder than, the related skeletal disorders achondrogenesis type 2 and hypochondrogenesis.<unk>  is a subtype of collagenopathy, types II and XI.
Spondyloepiphyseal dysplasia congenita
Spondyloepimetaphyseal dysplasia
Otospondylomegaepiphyseal dysplasia
Metaphyseal dysplasia
Achondrogenesis type 2
Craniodiaphyseal dysplasia
Craniometaphyseal dysplasia
Spondylo-meta-epiphyseal dysplasia