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CASE REPORT
Year : 2014  |  Volume : 14  |  Issue : 1  |  Page : 55-58

Lipoma arborescens of the knee: Report of a case with a full range of motion and literature review


1 Department of Orthopaedics, KMCH, Kannur, Kerala, India
2 Department of Orthopaedics, Vijayanagara Institute of Medical Sciences, Bellary, Karnataka, India

Correspondence Address:
V Prabhakar
#55, Rajyotsav Nagar, Rajivgandhi Road, Jaraganahalli, J.P. Nagar Post, 6th Phase, Bengaluru, Karnataka
India
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DOI: 10.4103/1319-6308.131629

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This report describes a rare intra-articular benign tumor, lipoma arborescens (LA), of the knee joint in a 35-year-old male. The patient suffered from left knee joint swelling for 3 years with occasional pain. Swelling was soft and boggy in the suprapatellar area. Motion of the joint was complete. No abnormality was detected in any laboratory tests. Magnetic resonance imaging (MRI) showed a large soft-tissue density in the suprapatellar area with high signal intensity on T1- and T2-weighted images. Operative arthroscopy revealed a creamy brown hypertrophied synovium with diffuse papillary processes characterized by villous proliferation of the synovium infiltrated by mature fat tissue, chronic inflammatory cells and vessels as seen in the pathologic slides. LA should be considered in patients with painless, slowly progressive swelling of a joint, especially the knee. MRI should be considered to exclude this pathology as well as other uncommon intra-articular pathology. Treatment with synovectomy is frequently curative.


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