RHEUMATOID NODULES - MR PATHOLOGICAL CORRELATION/

Purpose: To demonstrate the signal characteristics of subcutaneous rhe umatoid nodules in correlation to their histopathologic features. Meth od: The magnetic resonance imaging (MRI) features of biopsy proven sub cutaneous rheumatoid nodules are described in five patients with rheum atoid arthritis established by classic criteria. Results: Two morpholo gic appearances of rheumatoid nodules were observed on MRI: one predom inantly cystic, with enhancing peripheral component; and a second type which is predominantly solid, with uniform enhancement following gado linium injection. Conclusion: Subcutaneous rheumatoid nodules can appe ar by MR as solid, cystic, or a combination of both components. This c losely correlates with their histopathologic evolution.