Frequency of coexisting autoimmune diseases in 645 patients with relapsing polychondritis

	Number
Systemic vasculitis	73*
Rheumatoid arthritis	31
Systemic lupus erythematous	18
Sjögren's syndrome	15
Behçet syndrome	8
Ankylosing spondylitis	7
Reactive arthritis	6
Psoriatic arthritis	4
Systemic sclerosis	2
Polymyalgia rheumatica	2
Retroperitoneal fibrosis	1

* Encompasses both primary and secondary forms of vasculitis.

Graphic 81401 Version 3.0

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