[Acquired vertebral block with bone demineralization during Paget's disease].

The authors report an observation on a man 68 years of age suffering from Paget's disease in the pelvi-rachidian region. In four years the lumbar lesions evolved to form an L2-L4 vertebral block. The intensity of the bone radiotransparency of the vertebral block indicated some similarity to the localized forms of osteolysis well known in the skull and the long bones.