Disordered or heterotopic bone growth is a common feature in diaphyseal dysplasia (as caused by mutations in TGFB1), osteopetrosis subtypes (as caused by mutations in CLCN7 and TNFSF11 which codes for RANKL) and ossification of the posterior longitudinal ligament of spine (previously associated with rs13279799 for which we report an association with otosclerosis). This evidence concerns the gene CLCN7 and osteopetrosis.