The MRI characteristics have been well documented with well-defined nodules of intermediate signal on T1-weighted (T1W) images that are relatively low in signal on T2W sequences.4 Although synovial osteochondromatosis and pigmented villonodular synovitis arearthropathies associated with low-signal structures around joints, tendons, and bursa, these 2 entities more commonly occur as monoarticular processes and are more often seen in larger joints, such as the knee or hip. Additionally, there is no evidence of hemosiderin deposition to suggest pigmented villonodular synovitis, and the cartilage components in synovial osteochondromatosis are high in signal on T2W images. The fact that the patient had a similar abnormality at a different site should suggest the possibility of a systemic disease.
Rice-body formation has a characteristic appearance on MRI, manifesting as masses of intermediate signal on T1W images and low signal on T2W images. Their presence should alert the radiologist to the possibility of an inflammatory arthropathy.
Rheumatoid tenosynovitis with rice-body formation. Appl Radiol.