The purpose of this study was to evaluate the ability and accuracy of
   imaging in the diagnosis of the bone tumors comparing to the results of
   pathology.

          It was conducted by assessment of the records of 71 patients (between
   6-65 years of age) with primary diagnosis of bone tumors referred to the
   orthopedy department of Sina and Shariatti hospital in Tehran during two
   years (1993-1994) who had completed chart, lab data and radiographic
   studies as well as definite pathologic diagnosis. According to radiologic
   finding of each patient, three differential diagnosis were made and divided
   into the benign and malignant groups and then compared with the result
   of pathoogy, using Mc Nemar statistical test. Furthermore the frequency of
   bone tumors in these patients was assessed.

          Our findings showed that the most frequent benign and malignant
   tumors among these patients were giant cell tumor (18.3%) and
   Osteosarcoma (5.6%) and Uwing sarcoma(5.6%), respectively. Moreover
   the frequency of all the tumors including benign and malignant lesions in
   6-25 year old patients was more than other groups. Comparing the radiologic
   finding with the result of biopsy showed that if all the three radiological
   diagnosis conformed a benign lesion, we can expect the tumor is
   benign with the positive pedictive value of 100%. In our study these included
   88% of beign tumors and 65% of all the tumors that were reviewed.

          We can therefore conduct the diagnosis and therapulic processes in
   only one session to avoid further cost and time.