A Case of Localized Pigmented Villonodular Synovitis Presenting as Loose Body in the Knee Joint

Submit Manuscript | http://medcraveonline.com episode of instability with occasional episodes of locking. Other joints were normal. On clinical examination there was a mild swelling of the right knee joint, with retro-patellar tenderness. Results of Lachman test, anterior and posterior drawer tests, and varus and valgus stress tests were normal. Radiographic findings suggested a normal report (Figure 1). Sagittal T1, T2, coronal PD fatsat, axial T2 MRI of his right knee showed a well-circumscribed single loose body in the retropatellar fossa measuring 1.5*1.5*0.75 cm (Figure 2 & 3). The differential diagnosis at that time included loose body, synovial hemangioma, hematoma, localized PVNS, fibroxanthoma, and less likely a malignant lesion. The patient was considered for arthroscopic removal of the loose body under spinal anaesthesia. With arthroscope in the anterolateral portal, a Introduction