<unk>  is one of several congenital conditions with similar presentations, such as osteogenesis imperfecta, multiple epiphyseal dysplasia tarda,<unk> ondrogenesis, osteopetrosis, and thanatophoric dysplasia. This makes estimates of prevalence difficult, with changing and subjective diagnostic criteria over time. One detailed and long-running study in the Netherlands found that the prevalence determined at birth was only 1.3 per 100,000 live births. Another study at the same time found a rate of 1 per 10,000.
Achondroplasia
Pseudoachondroplasia
Thanatophoric dysplasia
Hypochondroplasia
Cartilage–hair hypoplasia
Metaphyseal dysplasia
Rachischisis
Cranioschisis