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A woman with knee pain and a lesion in the femur

Case Identification
Case ID Number: 
20140410KP
Periosteal Reaction: 
absent
Benign/Malignant: 
unknown
Clinical case information
Case presentation: 

This woman has activity related knee pain,and some pain at rest. A lesion is found in the distal emur, medial femoral condyle, and the concern is what may be causing the pain.

Radiological findings:: 
See images. A well defined medullary lesion with matrix mineral, without expansion or transgression of the nearby cortex. Bone scan shows mild focal uptake. MRI shos T1 dark T2 bright lesion with granular/lobular features see on closeups of MRI.
Laboratory results:: 
None requested
Differential Diagnosis: 
Cartilage lesions -
Pathology results:: 
See images