Stress fracture of distal femur

Case contributed by Dalia Ibrahim
Diagnosis almost certain

Presentation

Runner. Left thigh pain.

Patient Data

Age: Adult
Gender: Female

Hypointense fracture line in the distal femoral metadiaphysis with surrounding bone marrow and soft-tissue edema.  

Distal femoral metadiaphyseal medial cortical non ossifiying fibroma.

x-ray

The previously noted fracture at the MRI appears as a subtle sclerotic line at the plain X-ray.

The adjacent non ossifying fibroma is also seen as well defined bubbly lytic lesion merging with its medial cortex and showing narrow zone of transition. 

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