Lipoma arborescens

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[edit] 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.

[edit] 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.

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

[edit] References for Lipoma arborescens