(Fig 5-D.17) Periprosthetic Infection - Abscess

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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

1. Semin Musculoskelet Radiol 2017;21:147–164
2. Skeletal Radiol. 2021;50(12):2319-47

 

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#MRI #Infection #Abscess #MusculoskeletalRadiology #PenumbraSign #Osteomyelitis #RadiologyFindings #BoneLesions #SkinThickening #MedicalImaging