There are 4 different types of<unk> s: subcutaneous<unk> s, cardiac nodules, pulmonary nodules and central nervous system nodules. Subcutaneous<unk> s According to a study done by the BARFOT study group, 7% of individuals diagnosed with<unk>  arthritis reported the presence of subcutaneous<unk> s upon initial diagnosis. And about 30-40% of all those diagnosed with<unk>  arthritis reported developing these nodules throughout the course of the disease. Subcutaneous<unk> s is correlated with the increased risk of cardiovascular and respiratory disease, and those with detected subcutaneous<unk> s should be assessed for cardiovascular and respiratory risk factors. Cardiac nodules<unk> s may also form in the heart. Specifically, it could develop in the myocardium, pericardium, and other valvular structures, and these nodules can be discovered through echocardiograms. There are little studies with minimal data on the development of cardiac nodules in association with<unk>  arthritis, but the general consensus is that such occurrences is relatively rare. Pulmonary Nodules The reported prevalence of pulmonary nodules has varying depending on the method of detection. In a 1984 study done on lung biopsies in<unk>  arthritis, the reported prevalence was about 32% in a sample size of 40 individuals. However, another clinical study utilizing a different method of detection; plain film radiographs of the chest; showed that only 2 out of 516 people (~0.4%) diagnosed with<unk>  arthritis developed pulmonary nodules. Additionally, other clinical studies have reported increased pulmonary nodule growth following treatments with methotrexate, leflunomide, and etanercept. Central nervous system nodules Like cardiac nodules, nodules developing in the central nervous system is also relatively rare. Most reports of nodule growth on the central nervous system also presented with severe stages of erosive joint diseases. Generally, these nodules can be detected through MRI and confirmed through biopsies. As of right now, there are no known mediations that have been reported in reducing nodules in the central nervous systems.
Rheumatoid nodule
Villonodular synovitis
Plasma cell granuloma
Eosinophilic granuloma
Fibrin ring granuloma
Palindromic rheumatism
Colloid nodule
Cold nodule