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Felty syndrome is a rare complication of rheumatoid arthritis that affects the connective tissues. It is characterized by the triad of rheumatoid arthritis, an enlarged spleen, and a low white blood cell count (neutropenia). This condition is considered an autoimmune disorder, meaning the body's immune system mistakenly attacks its own tissues.12

The pathology involves inflammation of the joints and can also affect other organs and small blood vessels. In Felty syndrome, the spleen becomes enlarged, and the body produces fewer white blood cells, increasing susceptibility to infections. While the exact cause is not fully understood, it is believed to involve immune system dysfunction and antibody-antigen reactions.21

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