Alternative definition : NICHD: An autosomal recessive skeletal dysplasia caused by mutation(s) in the PTH1R
gene, encoding parathyroid hormone/parathyroid hormone-related peptide receptor. This
condition is characterized by severely delayed skeletal maturation, as well as by
abnormal modeling of the bones in the hands and feet, abnormal persistence of cartilage
in the pelvis, and mild growth retardation. Calcium and phosphate concentrations are
normal.;