Familial polyarteritis nodosa (PAN) is rare. We describe here two siblings who developed PAN 8 years apart. HLA typing showed that the affected family members shared a common haplotype with their unaffected mothers. Further study of the family history suggested the possibility of an inherited disorder of connective tissue predisposing to autoimmunity and aneurysm formation.
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Mason et al. (1994) studied this question.
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