IgA nephropathy and Reiter's syndrome. Report of two cases and review of the literature.

Immunoglobulin A (IgA) nephropathy is the commonest type of primary glomerulonephritis worldwide. It has previously been reported in association with the seronegative spondyloarthropathies (ankylosing spondylitis, Behcet's syndrome, psoriatic arthritis, Reiter's syndrome and the postenteritic arthritides). Since this condition was first described in 1968, 5 previous case reports of biopsy-proven IgA nephropathy associated with Reiter's syndrome have been published in the English-language literature. Here we report 2 more such cases, along with a review of the literature describing the association of IgA nephropathy and a number of other immune-complex-mediated glomerulonephritides with the seronegative spondyloarthropathies.