Ankylosing spondylitis with primary Sjögren's syndrome: the first two case-reports.

Sjögren's syndrome and ankylosing spondylitis can occur either alone or in conjunction with other disorders. We report on two patients who met criteria for both primary Sjögren's syndrome and ankylosing spondylitis. Class I and II histocompatibility phenotypes were strikingly similar in the two patients and are in favor of a chance association.