Abstract :
Key Words :
A Case of Pigmented Villonodular Synovitis Misdiagnosed as Seronegative Rheumatoid Arthritis
Sang Woo Lee, M.D., Seung Taek Lim, M.D., Jong Keun Kim, M.D., Young Ho Kim, M.D., Jun Hyuk Seo, M.D., Jun Cheol Yoon, M.D.,
Chan Woo Lee, M.D., Dong Ho Oh, M.D., Jae Wook Lee, M.D. , Gi Hyuk Moon, M.D. , Ae Lan Paik, M.D.
Departments of Internal Medicine, Department of Orthopedic Surgery ,
and Department of Pathology , Pohang Saint Mary s Hospital, Pohang, Kyungpook, Korea
Fig. 1. Knee AP shows nonspecific findings.
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Fig. 2. Knee MRI (T2WI) shows dark signal intensity in synovial thickening area due to hemosiderin deposition.
Fig. 3. Arthroscopy shows yellowish-brown colored large villi and synovial hypertrophy.
Fig. 4. Light microscoprc finding of the synovium shows hemosiderin-laden macrophages, multinucleated giant cells and villous patterned synovial proliferation (H&E stain, x 100).
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