[Ossification of the transverse ligament of the atlas. A report on three new cases (author's transl)].

Following the publication of the first two cases reported of ossification of the transverse ligament, the authors describe three recent observations of this lesion. In contrast to the first two cases, in which ossification was reported at the level of the cervico-occipital articulation, which was normal, these three new cases were noted to have associated acquired or congenital abnormalities of the craniovertebral junction.