Parosteal osteosarcoma

120 views525y Female10/9/2026

Clinical Presentation

Fell off a stool and landed on the right side. Hit right leg on the bed, tender right proximal femur and tender swollen right knee. Reduced ROM, can't weight bear.

1Lobulated exophytic lesion arising from the cortex of the dorsal aspect of the metadiaphyseal region of the distal femur measuring 9 cm in length
2Periosteal new bone formation at the lateral aspect of the distal femur raising concern
3No bony destruction or soft tissue involvement identified
44.8 x 4.9 cm exophytic juxtacortical mass arising from the posterior aspect diametaphyseal aspect of the distal femur
5Relatively minor cortical destruction and periosteal reaction
6The mass abuts the popliteal neurovascular bundle.Trace of joint effusion.No skip lesions in the proximal femur.