Case report 804: Chondroblastic osteosarcoma grade 3 of the left clavicle.

The summary, the case of a 15-year-old boy with osteosarcoma of the clavicle is presented, prompted by the rarity of primary tumors at that site and by this particular tumor's unusual roentgenographic appearance, which suggested a benign process. A review of the literature on clavicular tumors and malignancies is provided. Though extremely rare, primary tumors of the clavicle are more likely to be malignant than benign. This suggests tht serious consideration should be given to malignancy in the face of an apparently aggressive lesion of the clavicle, and perhaps even a benign-appearing tumor as well.