A woman with knee pain and a lesion in the femur

Case Identification

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

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
Case Answer
Clinical Case Answer