<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
Otospondylomegaepiphyseal dysplasia
Gnathodiaphyseal dysplasia
Craniometaphyseal dysplasia
Eccentrochondrodysplasia
Achondroplasia
Pseudo-Hurler polydystrophy
Thanatophoric dysplasia