Seropositive peripheral arthritis and subcutaneous rheumatoid nodules developed in a 50-year-old patient with preexisting ankylosing spondylitis. Subcutaneous nodules occurred in only 2 of 1,306 patients with ankylosing spondylitis previously reported.
Rosenthal SH, Lidsky MD, Sharp JT. Arthritis With Nodules Following Ankylosing Spondylitis. JAMA. 1968;206(13):2893–2894. doi:10.1001/jama.1968.03150130051017
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