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