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📌 Periprosthetic Infection - Abscess
✅ MRI Evaluation of Infection
- MRI is infrequently used to evaluate infection. However, typical MRI findings include skin thickening, edema, effusion, and fluid collections with abscess formation.
✅ Penumbra Sign
- In musculoskeletal radiology, the penumbra sign represents a rim of vascularized granulation tissue surrounding an intraosseous abscess cavity, with a higher T1 signal intensity than the cavity itself.
- This finding is a specific (~98%) but relatively insensitive (~55%) sign to distinguish subacute, chronic, or acute-on-chronic osteomyelitis from malignant and benign bone lesions.
References
- Semin Musculoskelet Radiol 2017;21:147–164
- Skeletal Radiol. 2021;50(12):2319-47
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
© 2022 MSK MRI Jee Eun Lee All Rights Reserved.
No unauthorized reproduction, redistribution, or use for AI training.
#MRI #Infection #Abscess #MusculoskeletalRadiology #PenumbraSign #Osteomyelitis #RadiologyFindings #BoneLesions #SkinThickening #MedicalImaging
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