Which features (not present) would suggest an aggressive nature?
Severe endosteal scalloping (>2/3 cortex), expansile remodelling, cortical breach, large size (>5-6cm) and pain.
Findings
Bone
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well-circumscribed lobulated lesion in the lateral femoral metaphysics (~18 x 20 x 15 mm) with internal foci of low signal, 'rings and arcs' characteristics and a narrow transition zone
Intercondylar region
mild amount of fluid
anterior cruciate ligament thin and atrophic with ganglion cyst
normal posterior cruciate ligament
Medial compartment
articular cartilage intact
medial meniscus inconspicuous
medial collateral ligament complex intact
Lateral compartment
articular cartilage intact
lateral meniscus inconspicuous
lateral collateral ligament complex intact
Patellofemoral compartment
articular cartilage intact
distal patellar tendon and quadriceps tendon unremarkable
Impression
inconspicuous chondroid lesion in the lateral femoral metaphysis consistent with an enchondroma
status post anterior cruciate ligament tear with small residual ganglion cyst