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There is effusion in the knee joint and its recesses, as well as diffuse, irregular synovial hypertrophy with lobulated contours and villous projections. The changes show intermediate signal on T1WI and T2WI, high signal on STIR and low signal 'blooming' on T2* GRE, suggesting haemosiderin deposition. The hypertrophic changes cause small erosions in the proximal tibia. The findings are most likely in keeping with diffuse form of pigmented villonodular synovitis (PVNS).
Oedematous changes in calf muscles are noted.