Miscellaneous diseases
- Enteric arthritis – Usually a large-joint oligoarthritis or spondyloarthritis with sacroiliitis. However, confusion with RA can occur in patients with peripheral polyarthritis and involvement of the MCP joints.
- Crystal arthropathy (gout or pseudogout)- Can become chronic and have a polyarticular distribution, resembling RA.
- Sarcoid arthropathy- May be oligo- or polyarticular, most often affecting the ankles, knees, hands, wrists, MCP and PIP joints.
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