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📌 Septic Arthritis
✅ Noncontrast MR Imaging
- On noncontrast MR imaging, joint effusion and perisynovial edema are commonly seen with septic joints.
- Unlike other etiologies for joint effusion, with infection, the surrounding soft tissues demonstrate marked inflammation and edematous changes, including fasciitis and myositis.
✅ Postcontrast Imaging
- Postcontrast imaging helps to evaluate the degree of synovial inflammation and the presence of perisynovial abscess.
- These associated findings increase the degree of confidence in suggesting septic arthritis.
- Imaging protocol should include T1-weighted sequences to evaluate for concomitant osteomyelitis.
✅ Earliest Findings of Septic Arthritis
The earliest findings in septic arthritis, including synovial inflammation and effusions, are readily demonstrated.
✅ Acute Stage of Septic Arthritis
- Bone marrow signal abnormality is also a frequent finding in the acute stage.
- At this stage, bone marrow edema usually represents inflammation.
- If contrast is administered intravenously, a marked rim enhancement of the synovium or of a thickened abscess wall (if present) can be seen.
References
- Magn Reson Imaging Clin N Am. 2016 May;24(2):369-89
- Magn Reson Imaging Clin N Am 12 (2004) 111–124
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
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#SepticArthritis, #MRI, #Radiology, #JointEffusion, #SynovialInflammation, #PerisynovialEdema, #Osteomyelitis, #Fasciitis, #Myositis, #BoneMarrowEdema
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