(Fig 5-E.12) Lipoma Arborescens

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📌 Lipoma Arborescens

Lipoma arborescens is a nonneoplastic villous synovial proliferation with replacement of the subsynovial connective tissue by mature fat and scattered inflammatory cells.

 

✅ MRI Diagnosis

MRI is the modality of choice for diagnosis. A typical appearance is of a fat-containing frond-like synovial mass, usually outlined by concurrent joint effusion. The lesion follows the signal intensity of fat on all sequences:

• T1: High signal; will saturate on fat-suppressed sequences
• T2: High signal; will saturate on fat-suppressed sequences
• Gradient Echo (GE): Chemical shift artifact is sometimes seen at the fat-fluid interface

 

✅ Forms

• Primary Idiopathic Form: Affects younger patients.
• Secondary Form: More common, superimposed on an underlying arthropathy, typically osteoarthrosis or rheumatoid arthritis. Affects an older population with a male predominance.

References

RadioGraphics 2018; 38:2069–2101

 

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#LipomaArborescens, #MRI, #Radiology, #FatSignal, #JointEffusion, #T1Sequence, #T2Sequence, #SynovialProliferation, #Osteoarthrosis, #RheumatoidArthritis