(Fig 5-E.07) Extracapsular Locations of Tophi

https://youtu.be/LEV075GcR30

 

 

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📌 Extracapsular Tophi

Extracapsular tophi typically affect the prepatellar bursae and extensor mechanism, leading to several characteristic changes:

• Anterior soft-tissue prominence
• Bursal distention
• Tendon enlargement due to intratendinous urate deposition
• Well-marginated erosions at the patella and tibial tuberosity

 

📌 Subcutaneous or Extra-Articular Tophi

• Subcutaneous or extra-articular tophi are usually a late manifestation and often occur together with intra-articular tophaceous deposition. 
• Extra-articular tophi are relatively rarer than intra-articular tophi, and in most patients, extra-articular tophi are associated with intra-articular lesions.

 

References

1. RadioGraphics 2018; 38:2069–2101
2. J Clin Rheumatol. 2010 Aug;16(5):209-14

 

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#ExtracapsularTophi, #PrepatellarBursae, #ExtensorMechanism, #UrateDeposition, #TophaceousDeposition, #SubcutaneousTophi, #ExtraArticularTophi, #SoftTissueProminence, #BursalDistention, #TendonEnlargement