| A rare primary bone dysplasia with characteristics of severe developmental delay and skeletal dysplasia (including short stature, premature carpal ossification, platyspondyly, longitudinal metaphyseal striations, and small epiphyses), as well as moderate to severe intellectual disability and facial dysmorphism, including prominent forehead, mild synophrys, depressed nasal bridge, prominent bulbous nasal tip and full lips. Caused by homozygous or compound heterozygous mutation in the NANS gene on chromosome 9q22. |
