43-year-old female runner. Rule out stress fracture. Lucency on plain films. There is focal cortical and endosteal thickening along the posterior aspect of the tibial diaphysis as seen on recent radiographs. There is mild edema within the underlying marrow as well as along the cortical surface compatible with a stress fracture. Of note, there is minimal edema seen within the contralateral tibial diaphysis, which may also represent stress reaction/fracture. There is a tiny amount of fluid within the semimembranosus/gastrocnemius recess. The imaged musculature is normal in appearance.
Stress fracture of the mid tibial diaphysis as described above.