Osteosarcoma of the distal femur

120 views517y Female10/9/2026

Clinical Presentation

Right knee pain.

1The distal half of the femur is occupied and expanded with a heterogeneous mass with areas of bone formation
2Posterior the periosteum is elevated (Codman's triangle)
3Delayed phase bone scan image demonstrates intense uptake in the distal right femur
4A single focus of increased attenuation projects just to the right of the sternum inline with the chondral cartilage of the third rib
5No other suspicious lesions identified
6MRI through the lesion demonstrates a soft tissue mass completely replacing the medullary cavity and extending into the adjacent soft tissues
7It is low to intermediate in signal on T1 and high on T2 weighted images
8Distribution of osteosarcomas
9The most frequent location is around the knee
10Layout and distribution: Frank Gaillard 2009, Line drawing of skeleton: Patrick Lynch 2006, Creative Common NC-SA-BY A limb sparing resection has been performed