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| Lesion Stage | MRI Finding |
|---|---|
| Grade 1 | Periosteal edema only |
| Grade 2 | Bone marrow edema (only on T2) |
| Grade 3 | Bone marrow edema on T1 and T2 |
| Grade 4a | Multiple discrete areas of intracortical signal changes |
| Grade 4b | Linear areas of intracortical signal change correlating with a frank stress fracture |
