TY - JOUR T1 - Spinal ankylosing spondylitis: a variant form of ankylosing spondylitis or a distinct disease entity? JF - Annals of the Rheumatic Diseases JO - Ann Rheum Dis SP - 368 LP - 371 DO - 10.1136/ard.44.6.368 VL - 44 IS - 6 AU - J T Gran AU - G Husby AU - M Hordvik Y1 - 1985/06/01 UR - http://ard.bmj.com/content/44/6/368.abstract N2 - In a population survey of ankylosing spondylitis (AS) seven subjects, six males and one female, had x-ray changes in the lumbar spine typical of AS but without concomitant roentgenological sacroiliitis. The overall prevalence of such cases in the population studied was 0.37%. Four out of these seven subjects carried the tissue antigen HLA-B27 (57%). The clinical and roentgenological features of these subjects are described and it is suggested that the x-ray findings represent a mild and variant form of primary or definite AS. ER -