Lipoma Arborescens of the Knee: Report of Three Cases and Review of the Literature.
Ioannis TsifountoudisDimitrios KapoutsisAnastasios-Nektarios TzavellasIoannis KalaitzoglouApostolos TsikesGeorge GkouvasPublished in: Case reports in medicine (2017)
Lipoma arborescens is a chronic, slow-growing, intra-articular lesion of benign nature, which is characterized by villous proliferation of the synovium, with replacement of the subsynovial connective tissue by mature fat cells. It usually involves the suprapatellar pouch of the knee joint. It is not a neoplasm but is rather considered a nonspecific reactive response to chronic synovial irritation, due to either mechanical or inflammatory insults. We report three cases of lipoma arborescens affecting the knee, the first in a young male without previous history of arthritis or trauma, the second in a 58-year-old male associated with osteoarthritis, and the final in a 44-year-old male diagnosed with psoriatic arthritis, which cover the entire pathologic spectrum of this unusual entity. We highlight the clinical findings and imaging features, by emphasizing especially the role of MRI, in the differential diagnosis of other, more complex intra-articular masses.
Keyphrases
- knee osteoarthritis
- total knee arthroplasty
- rheumatoid arthritis
- induced apoptosis
- contrast enhanced
- magnetic resonance imaging
- high resolution
- cell cycle arrest
- oxidative stress
- adipose tissue
- signaling pathway
- anterior cruciate ligament
- anterior cruciate ligament reconstruction
- computed tomography
- magnetic resonance
- low grade
- cell death
- radiation therapy
- cell proliferation
- mass spectrometry
- diffusion weighted imaging
- drug induced
- trauma patients