[Myelopathic patterns of calcification of the posterior longitudinal ligament]

Three patients with calcification of the posterior longitudinal ligament with myelopathy are reported and discussed. This condition which is frequent in Japan is rarely described in the western population. Such calcification is not only a radiographic finding but is a progressing phenomenon which may extend to compressive lesions of the spinal cord. All patients with calcification of the posterior longitudinal ligament should be fully studied neurologically and followed up.