[Rheumatoid arthritis and ankylosing spondylitis].

A case of a patient having ankylosing spondylitis of 16 years duration is presented. Eight years ago developed a clinical picture with symptoms which completely fulfill criteria for diagnosing rheumatoid arthritis with exception of rheumatoid factor. As a conclusion we can say that in our patient there have been developed ankylosing spondylitis and rheumatoid arthritis as a coexistence of two diseases.