An unusual cartilage lesion

Case Identification

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

Clinical case information

Case presentation

A 67 year old woman has knee pain, and xrays that show a lesion has developed in a previously normal part of her distal femur sometime over the last two years.

Radiological findings:
An eccentric lesion with some features that are reassuring, but others that are worrisome. There appears to be thinning or break-through of the cortex.
Pathology results:
Biopsy results are shown. What is the diagnosis?
Treatment Options:
What is the best treatment option?
Case Answer
Clinical Case Answer