Following are listed as (SpA) spondyloahritis features except

The spondyloahritides is a group of overlapping disorders that share ceain clinical features and genetic associations. These disorders include ankylosing spondylitis (AS), reactive ahritis, psoriatic ahritis and spondylitis, enteropathic ahritis and spondylitis, juvenile onset spondyloahritis (SpA), and undifferentiated SpA. The similarities in clinical manifestations and genetic predisposition suggest that these disorders share pathogenic mechanisms. Reference: Harrison&;s Principles of Internal Medicine; 20th edition; Chapter 384;