A 48-year-old woman presents with pain, stiffness, and swelling of the joints in her fingers. She reports morning stiffness lasting more than an hour before it eases. On examination there is symmetric swelling of the metacarpophalangeal and proximal interphalangeal joints of both hands, visible hand deformity, and small subcutaneous nodules over the extensor surface of both forearms near the elbows (olecranon). [Continuation] You refer her to a rheumatologist, who starts her on a corticosteroid to control her symptoms while further disease-modifying treatment is arranged.
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What is the most likely diagnosis?
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