Zhao Haitao, Maheshwari Aditya V, Kumar Dhruv, Malawer Martin M
Department of Orthopedic Oncology, Beijing JiShui Tan Hospital, Peking University, 31 Xinjiekou East Street, Xicheng District, Beijing 100035, China.
Case Rep Med. 2011;2011:491470. doi: 10.1155/2011/491470. Epub 2011 Jun 1.
Pigmented villonodular synovitis (PVNS) is a rare, benign, proliferating disease affecting the synovium of joints, bursae, and tendon sheaths. Involvement of bursa (PVNB, pigmented villonodular bursitis) is the least common, and only few cases of exclusively extra-articular PVNB of the pes anserinus bursa have been reported so far. We report a case of extra-articular pes anserine PVNB along with a review of the literature. The lesion presented as a painful soft tissue mass in the medial part of the proximal leg. A magnetic resonance imaging showed areas of low to intermediate signals in all sequences and the lesion enhanced heterogeneously with contrast. Diagnosis was confirmed by an incisional biopsy, and an intralesional resection was performed. The postoperative course was uneventful, and the patient is free of disease with no functional deficit at 2 years followup. As with other rare lesions, clinical and radiographic findings in addition to histological examination are essential for correct diagnosis.
色素沉着绒毛结节性滑膜炎（PVNS）是一种罕见的良性增殖性疾病，可累及关节、滑囊和腱鞘的滑膜。滑囊受累（PVNB，色素沉着绒毛结节性滑囊炎）最为少见，迄今为止，仅有少数关于鹅足滑囊单纯关节外PVNB的病例报道。我们报告1例关节外鹅足PVNB病例并进行文献复习。该病变表现为小腿近端内侧的疼痛性软组织肿块。磁共振成像显示在所有序列中均为低至中等信号区，病变在增强扫描时呈不均匀强化。通过切开活检确诊，并进行了病损内切除。术后过程顺利，在2年随访时患者无疾病且无功能缺陷。与其他罕见病变一样，除组织学检查外，临床和影像学表现对于正确诊断至关重要。
