Expansile T1 low/STIR high signal enhancing mass centred on the distal femoral metaphysis extending into the epiphysis.
Cortical thinning and minor cortical breech on the lateral femoral aspect with the mass extending into the intracondylar notch.
No intra-lesional fluid-fluid levels.
Pathological fracture through the lesion with a small lipohaemarthrosis.