• Anterior tibia
• Cortical
Rare lesion 80% are in the anterior tibia diaphysis
Few are multifocal involving the fibula
Expansile, lytic, intracortical
DIFFERENTIAL
OSTEOFIBROUS DYSPLASIA
FIBROUS DYSPLASIA
Ground glass architecture
Younger age
Anterior bowing
Osteolytic
Expansile
Benign lesion
Young children
Intracortical
Fracture and pseudarthrosis occur