Discussion of Lipoma arborescens
- Lipoma arborescens is a rare intraarticular lesion
- Characterized by the replacement of the subsynovial tissue by mature fat cells, giving rise to a villous synovial proliferation.
- Lipoma arborescens is usually monarticular
- Occurs most frequently in the knee, particularly in the suprapatellar pouch.
- Most patients are in the 5th to 7th decades of life.
- Most accepted hypothesis suggests that lipoma arborescens represents a nonspecific synovial reaction to inflammatory or traumatic stimuli rather than a neoplasm.
- Synovectomy is the definitive treatment.
- Postoperative recurrence is uncommon.
 Imaging Findings for Lipoma arborescens
- Lipoma arborescens has many characteristic imaging findings.
- US demonstrates a hyperechoic, frondlike mass that bends and waves in real time during joint manipulation.
- The characteristic subsynovial hypertrophic adipose proliferation allows for a precise diagnosis with MR imaging, especially when T1-weighted and fat-suppressed sequences are used.
 See Also
 External Links
 References for Lipoma arborescens
- Patrick J. Sheldon, Deborah M. Forrester, and Thomas J. Learch. Imaging of Intraarticular Masses. RadioGraphics 2005 25: 105-119.