A chronic systemic disease, primarily of the joints, marked by inflammatory changes in the synovial membranes and articular structures, widespread fibrinoid degeneration of the collagen fibers in mesenchymal tissues, and by atrophy and rarefaction of bony structures. Etiology is unknown, but autoimmune mechanisms have been implicated.
Rheumatoid Arthritis
D013154
Spleen
An encapsulated lymphatic organ through which venous blood filters.
D013156
Splenectomy
Surgical procedure involving either partial or entire removal of the spleen.