[The posterior arch of the Paget's ivory vertebra. Biopsy of six cases (author's transl)].

The authors report 6 cases of isolated "ivory" vertebra which were confirmed as being due to Paget's disease after trocar biopsy. They analyse the radiological characteristics and find evidence of constant involvement of the posterior arch which shows the classical signs of Paget's disease: bone condensation, increase in size and cortico-medullary de-differentiation.