摘要
Spondyloepiphyseal dysplasia （SED） comprises a group of hereditary disorders caused by osteochondrodysplasia of the spine and long tubular bones owing to chromosome abnormalities） SED can be divided into two major types, termed SED congenita and SED tarda, according to the time of onset,
Spondyloepiphyseal dysplasia （SED） comprises a group of hereditary disorders caused by osteochondrodysplasia of the spine and long tubular bones owing to chromosome abnormalities） SED can be divided into two major types, termed SED congenita and SED tarda, according to the time of onset,
