Presentation
Leg pain.
Patient Data
Age: 12 years
Gender: Male
From the case:
Osteosarcoma
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Frontal

Multicentric lucencies within the distal femoral diaphysis and metaphysis. Ill-defined margins with periosteal reaction and Codman triangle formation.
Case Discussion
This bone lesion has aggressive features and was subsequently resected and shown to be osteosarcoma.