Pigmented Villonodular Synovitis Developing in the Knee of a Rheumatoid Arthritis Patient Mistaken as a Rheumatoid Arthritis Flare-Up
10.3904/kjm.2019.94.1.133
- Author:
Sang Yeob LEE
1
;
Sung Won LEE
;
Won Tae CHUNG
Author Information
1. Division of Rheumatology, Department of Internal Medicine, Dong-A University Hospital, Busan, Korea. wtchung@dau.ac.kr
- Publication Type:Case Report
- From:Korean Journal of Medicine
2019;94(1):133-136
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Pigmented villonodular synovitis is a benign tumor arising from synovial fibroblasts or histiocytes. There are diffuse and localized forms: the former involves the entire synovium and the latter consists of nodules, small tumefactions, or pedunculated masses. The knee is the joint most commonly affected and the clinical diagnosis is difficult, so initial misdiagnosis is common. We report a case of pigmented villonodular synovitis developing in the knee of rheumatoid arthritis (RA) patient, mistaken for an RA flare-up.
