Right thigh pain in a 37 year old man

Case ID Number: 
20090727TP
Image Modality: 
MRI
Tumor Type: 
unknown tumor - small round blue cells
Benign/Malignant: 
unknown
Body Region: 
hip and proximal femur
Bone Name: 
femur
Location in bone:: 
diaphyseal
Periosteal Reaction: 
present
Position within Bone: 
central
Tumor Behavior: 
active
Tumor Density: 
mixed