Register of primary malignant tumors of the bone at the Rizzoli Orthopaedic Institute in Bologna.

2,123 cases of primitive malignant bone tumors were collected from January 1982 to December 1992 at the Registry of Rizzoli Orthopaedic Institute. General data (name, age, gender, site, diagnosis) and histological and imaging documentation for each patient were filed. Considering the incidence of these tumors, we can assume that this registry (with contribution of more than 50 institutions) collect about 50% of italian cases of primitive malignant bone tumors. This registry permits informations regarding epidemiology, diagnosis and therapy of these rare neoplasms.