Two cases of the latent form of Asphyxiating Thoracic Dystrophy or Asphyxiating Thoracic Dystrophy without respiratory disease or respiratory problems are reported. The skeletal survey was diagnostic in both of them. In the first case it was performed after the pelvic film, ordered because of externally rotated thighs, showed triradiate acetabulum. In the second case the skeletal survey was requested because of undiagnosed mental retardation syndrome.