This report analyzes 25 tumors designated “primitive multipotential primary sarcoma of bone.” The lesions were most common (60%) in the second and third decade and were distributed equally between males and females. Anatomically they occurred in long or flat bones; the most common site was the femur. Roentgenographically the lesions were nonspecific. Pathologically there were 10 types of histologic differentiation in addition to a basic undifferentiated pattern.
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