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Coexisting rheumatoid arthritis and ankylosing spondylitis.

Rheumatoid arthritis and ankybosing spondylitis are considered to be separate and unrelated diseases, readily diffarentiatad in most cases. Diagnostic confusion may occasionally arise when the signs and symptoms of the one disease overlap those of the other or, more rarely, when both entities coexist within the same patient. There are 21 examples of the batter detailed in the English language literature. The cumulative data from these reports indicate that the clinical and radiographic manifestations of either disease are apparently unmodified by the presence of the other. Thus, diagnostic precision can be achieved by an awareness of this potential association. We report two more cases of coexisting rheumatoid arthritis and ankybosing spondylitis, the first to our knowledge in the radiobogic literature.