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Differentiating stress fracture from osteoid osteoma
| Stress fracture | Osteoid osteoma | |
|---|---|---|
| Radiograph | Linear infraction in the centre of cortical thickening | Round nidus in the centre of cortical thickening |
| Follow-up radiograph | May resolve or reduce in size | Stable |
| MRI | Marrow oedema with or without fracture line | Marrow oedema, half-moon sign |
| CT | Linear fracture line with surrounding sclerosis | Central nidus with surrounding sclerosis |
| Scintigraphy | Linear uptake | Double density sign |
