1. Woodrow38 and Khan et al.33 No firm association between such non-B27 B locus antigens and
2. Two different clinical pictures of AS emanate from the above-mentioned studies, as has already been suggested by Dekker-Saeys in 1976.29;a
3. B27 associated diseases 433 with B27. Sacroiliitis without axial involvement in psoriasis is only slightly associated with B27.2 44"In patients with sacroiliitis without axial involvement and IBD no association with B27 has been found.29 49 When, however, spondylitis accompanies sacroiliitis in psoriasis or
4. Yersinia (Table 2) The first reports
5. This review shows that the strong interrelationship of AS, RS, ReA, and AAU, especially in the presence of B27, is remarkable. In 1974 Moll and Wright suggested calling this group of strongly interrelated diseases 'the seronegative spondarthritides'.7>81 It is evident, however, that this name has no reference to AAU, except when AAU is an extra-articular manifestation of AS. Some authors even considered B27+AAU to be a monosymptomatic manifestation or 'forme fruste';of