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An unusual cartilage lesion

Case Identification
Case ID Number: 
Periosteal Reaction: 
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?
Image Reference: