Coincident seronegative spondarthritis: a case report.

A patient is described in whom ankylosing spondylitis (AS) and reactive arthritis (ReA) coincided. Follow-up five years later showed no progression of his AS. He demonstrates that some individuals do have the capacity to express seronegative spondarthritides in different ways, possibly dependent on the infective trigger. The lack of long term effect of the second disease is both clinically reassuring and theoretically intriguing.