Department of Orthopedic Surgery, Daejeon St. Mary's Hospital, The Catholic University of Korea, 520-2, Deahung-Dong, Joong-Ku, Daejeon 302-803, South Korea.
Knee Surg Sports Traumatol Arthrosc. 2010 Oct;18(10):1352-5. doi: 10.1007/s00167-010-1168-3. Epub 2010 Jun 5.
Synovial lipoma arborescens (SLA) is a rare, benign, fat-containing synovial proliferative lesion that is typically known to affect the knee joint in adults, although it has also been described in other joints. SLA usually presents as a painless swelling and recurrent joint effusion, and the laboratory test results, including aspirated synovial fluid, are usually normal. We present here two cases of SLA of the knee, which presented as spontaneous recurrent hemarthroses in elderly patients with osteoarthritis (OA) with bloody aspirated synovial fluid. Magnetic resonance imaging (MRI) and arthroscopic synovectomy suggested the diagnosis of SLA; the histopathologic examination confirmed the diagnosis. One year later, both patients remain symptom-free and report no new episodes of hemarthrosis. We postulate that SLA should be included in the differential diagnosis of patients with recurrent joint effusions with hemarthrosis in elderly patients with OA. The clinical presentation, MRI findings, and treatment of SLA are described, and the entity is briefly reviewed.
滑膜脂肪瘤病（SLA）是一种罕见的良性含脂肪滑膜增生性病变，通常见于成人膝关节，但也有其他关节发病的报道。SLA 通常表现为无痛性肿胀和反复发作的关节积液，实验室检查结果（包括抽吸的关节液）通常正常。我们在此报告 2 例膝关节 SLA，其表现为老年骨关节炎（OA）患者反复出现自发性关节积血，抽吸的关节液为血性。磁共振成像（MRI）和关节镜滑膜切除术提示 SLA 的诊断；组织病理学检查证实了诊断。1 年后，两名患者均无症状，且无新的关节积血发作。我们推测，对于老年 OA 患者反复发作的关节积液伴关节积血，应考虑 SLA 的鉴别诊断。本文描述了 SLA 的临床表现、MRI 表现和治疗，并简要回顾了该病。
