The diagnosis of primary tumors with inaugural bone metastases is a se
rious and difficult problem commonly encountered in rheumatology, Help
ful information can be derived from the radiologic appearance of the m
etastases, history of the patient, clinical findings, chest film, stan
dard laboratory tests, imaging studies, serum marker assays, and histo
logic findings, Based on our personal experience and on previously pub
lished data, we have developed a decision tree aimed at enhancing the
efficacy of the diagnostic process while ensuring optimal patient comf
ort and containing costs.