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Fig. 2 | BMC Musculoskeletal Disorders

Fig. 2

From: Multifocal pigmented villonodular synovitis coexisting in both the knee joint and the patella: a case report and literature review

Fig. 2

Magnetic resonance imaging (MRI) reveals extensive nodular synovial proliferation in the knee, a well-defined lesion confined to the patella and a lobulated mass-like lesion in the poplitea. Sagittal T1-weighted scans (a1, a2) show inhomogeneous low signal foci and depict a clear border of the foci. Axial T2-weighted scans (b1, b2) exhibits long T2 signal of joint effusion and tissue edema. Proton density-weighted imaging (c1, c2) shows lobulated, heterogeneous lesions with high intensity of PDWI signals are in patella, the suprapatellar bursa and the posterior region of knee. Focal hypointense areas represent the hemosiderin. No destructive lighment changes and cartilage damage is detected. After the administration of gadolinium-DTPA fat suppressed T1-weighted imaging (d1, d2) illustrates a distinct enhancement of the foci. The MRI appearance of is suggestive of the PVNS diagnosis

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