He was told he has cancer - do you agree?

Case Identification

Case ID Number
Position within the bone
Periosteal reaction
Benign or Malignant

Clinical case information

Case presentation

This man is 71. He has thigh pain and xrays were ordered. The radiologist made the following statement in the report: "The appearance is consistent with a malignant sarcoma or a metastatic cancer." What do you think?

Radiological findings:
A mid femoral lesion with some erosion of the periosteum is seen, with a partially calcified mass extending into the soft tissues.
Differential Diagnosis
What other process could explain this lesion?
Further Work Up Needed:
What would be the next step in the work-up?
Case Answer
Clinical Case Answer