A huge mass in the knee

Case ID Number: 
20090728HM
Image Modality: 
Xray
Image Display Oder: 
0.00
Tumor Type: 
unknown tumor - bone
Benign/Malignant: 
unknown
Body Region: 
knee, thigh, distal femur, proximal tibia
Bone Name: 
femur
Location in bone:: 
metaphyseal
Periosteal Reaction: 
absent
Position within Bone: 
surface
Tumor Behavior: 
aggressive
Tumor Density: 
blastic