Localized pigmented villonodular synovitis of the knee

Pigmented Villonodular Synovitis about the Ankle: A Review of the Literature and Presentation in 10 Athletic Patients

“…4,24 Histologically, PVNS may appear as a broad sheet of histiocytes with scattered lymphocytes, lipid and hemosiderin-laden foam cells, and multinucleated giant cells (Figure 2). 2,8,17 The multinucleated giant cells and the foam cells distinguish PVNS from other arthropathies (Figure 3). 8 Radiographic evaluation of PVNS often depicts increased soft tissue density and can show bony erosions (Figure 4, A and 4, B).…”

Locking of the knee caused by localized pigmented villonodular synovitis: a case report

“…The patient occasionally presents with various symptoms such as pain, swelling, or a palpable mass in the knee. 2,3 There are a few previous case reports of localized PVS lesions producing meniscal symptoms. [4][5][6] In the present case, prior to surgery the patient had a recurrence of her knee locking, such as might occur with a locking bucket handle tear of the meniscus.…”

Two contrasting presentations of localised pigmented villonodular synovitis of the knee

“…PVNS is a benign proliferative disorder of the synovium of uncertain cause [6]. It occurs particularly in large joints, especially the knee (75% of all cases [9]), with a peak incidence of presentation during the fourth decade [8].…”

“…Roentographic findings tend to be absent, with MRI being the best choice of non-invasive pre-operative evaluation [2,6]. Ultrasonography is user dependent and may be nondiagnostic.…”