ENPP1 and ossification of the posterior longitudinal ligament of the spine: Reports also suggest adults with monoallelic ENPP1 variants exhibit low ENPP1 activity, low PPi levels and FGF23‐mediated hypophosphatemia, and for these patients presenting with low bone mineral density, early‐onset osteoprorosis, or presentation of OPLL and DISH, a diagnosis of ENPP1 Deficiency should be entertained.