Bone marrow edema
In plain language
A fluid-sensitive MRI signal change inside bone that may reflect injury or another process; the cause depends on location and context.
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3 things to know first
- It is an MRI pattern inside bone. It is not the same as visible joint fluid.
- Many causes are possible. Trauma, stress, joint wear, infection, and other conditions can alter marrow signal.
- The pattern and symptoms matter. The term alone is not a diagnosis.
What it is
Bone marrow is the tissue inside bones. On fluid-sensitive MRI images, an area with increased signal is often described as bone marrow edema or an edema-like pattern. The image does not literally measure how much free water is present or identify one cause.
Why it appears on your report
Radiologists note the exact bone and location, whether there is a fracture line, nearby cartilage damage, or joint inflammation. This context helps distinguish a bone bruise from stress injury or other processes.
How serious is it
Small areas after a minor injury may improve over time; extensive change or an associated fracture needs closer evaluation. Treatment depends on the cause, symptoms, and ability to bear weight.
When to seek care urgently
Get prompt assessment for inability to bear weight after injury, fever with a very painful area, or rapidly worsening symptoms.
What usually happens next
- Correlate the location with pain and injury history.
- Review the report for fracture or other associated findings.
- Discuss activity, follow-up, and any further tests with a clinician.
Further reading
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