Fig. 1From: Multifocal pigmented villonodular synovitis coexisting in both the knee joint and the patella: a case report and literature reviewFrontal (a), lateral (b) and the axial (c) views of the patella show a well-defined lytic lesion in the left patella, which has eroded almost all the medial half of the patella. Small degenerative osteophyte formation and slight knee joint effusion is also presentedBack to article page