Case report 703: Multifocal osteosarcoma.

There are two theories concerning the origin of multifocal osteogenic sarcoma: In one, the lesions all arise synchronously as multiple, simultaneously appearing, primary tumors, and in the other, there appears to be one dominant site with early and rapidly progressive metastatic disease. We believe that our patient fits into the second group with a primary right (distal-end) femoral osteogenic sarcoma with early and rapid metastasis. Bone scan, chest CT, and MRI examinations played an essential role in the initial evaluation and follow-up of this patient with osteosarcomatosis. The multiple modalities also offered a greater sensitivity in the detection and for the surveillance of the progression of the condition.