Figure 34.

Osteosarcoma of the left distal femur with lung metastases. (a,b) Axial FDG PET-CT of the left distal femur shows a hypermetabolic mass (white arrows) primarily within the soft tissues surrounding the sclerotic bone. The patient had recently completed neoadjuvant chemoradiation therapy (CRT) for an osteosarcoma of the left distal femur, with poor treatment response. (c) Multiple cannon ball, intensely hypermetabolic lung metastases (white arrowheads) are present on an axial FDG PET-CT of the chest. Pre-CRT, the lung metastases were very small.