<unk>  <unk>  is a disease that results from ligand-independent activation of the type 1 (PTH1R) of the parathyroid hormone receptor, due to one of three reported mutations (activating mutation).<unk>  is extremely rare, and as of 2007 there are fewer than 20 reported cases worldwide. There are only 2 known families, from Dubai and Texas, in which the disease was passed from mother to daughter (Texas), and from a mother to her 2 sons (Dubai).
Jansen's metaphyseal chondrodysplasia
Sprengel's deformity
Metaphyseal chondrodysplasia Schmid type
Achondrogenesis type 2
Majewski's polydactyly syndrome
Achondrogenesis type 1B
Tailor's bunion
Léri–Weill dyschondrosteosis