A Rare Intra-articular Pathology of Knee Lipoma Arborescens: A Report of Two Cases Managed by Arthroscopic Synovectomy: 膝關節罕見的關節內病變--樹枝狀脂肪瘤：由關節鏡滑膜切除術醫治的兩個病例報告

Lipoma arborescens is a rare intra-articular condition of unknown exact aetiology. Lipoma arborescens is one of the differential diagnoses of diffuse chronic swelling of the knee and its magnetic resonance imaging (MRI) appearance is diagnostic. We present two cases of patients with recurrent knee effusion. MRI showed a frond-like fatty synovial mass and joint effusion that suggested the likelihood of lipoma arborescens. Arthroscopic synovectomy was performed and pathology confirmed the diagnosis. There was no recurrence of symptoms after synovectomy.

中文摘要樹枝狀脂肪瘤是罕見而未知確切病因的關節內病症。樹枝狀脂肪瘤是造成慢性膝關節腫腿的鑑別診斷之一，從它的磁共振成像已經可以確定診斷。我們報告了兩個出現復發性膝關節積液的病例。當中磁共振成像顯示呈脂肪質量滑膜和關節積液，暗示了樹枝狀脂肪瘤的可能性。關節鏡滑膜切除術和其後的病理化驗確定了診斷。滑膜切除術後病人並沒有復發症狀。