Destructive and ossifying spondylitic changes in rheumatoid ankylosing spondylitis (pelvo-spondylitis ossificans).
D000844:Ankylosis; D006801:Humans; D013166:Spondylitis; D013167:Spondylitis, Ankylosing / Q000150:complications*
SPONDYLITIS, ANKYLOSING/complications