Bone scan appearance in aggressive osteogenic sarcoma with pleural, lung, bone, and soft-tissue metastases.

A 40-year-old woman presented with a known case of osteogenic sarcoma of the right leg and underwent below-the-knee amputation. The preoperative workup was negative for distant metastases, and the patient was followed regularly. Two years later she developed dyspnea and chest pain. Computed tomography revealed diffuse left lung metastases with pleural involvement and nodular metastases in the right lung. Tc-99m methylene diphosphonate whole-body bone scanning revealed the amputated right leg with a clean stump but with widespread metastases in the right thigh involving soft tissue and bone, and the pelvis, left femur, and skull. In addition, diffuse left lung metastases involving both parietal pleura and lung parenchyma were seen. Tc-99m methylene diphosphonate uptake has been observed in the soft tissue and lungs in patients with osteogenic sarcoma but is rarely observed in practice with this degree of aggressiveness.