[Multipotent primary bone sarcoma]

The results of clinical and roentgen-morphological studies on 17 cases of multipotent primary sarcoma of the bone are presented. The difficulties of the tumor recognition are due to the fact that it occurs rarely, has no specific clinical-roentgenological picture and shows marked tissue polymorphism. Most frequent are differentiations of the type of osteogenic sarcoma, chondrosarcoma, reticulosarcoma with simultaneous combination with areas having the structure of Ewing's tumor, or extensive fields of undifferentiated primitive tumor cells. Further studies are necessary to decide whether or not this tumor is an independent form among other known skeletal neoplasias.