PT - JOURNAL ARTICLE AU - J T Gran AU - G Husby AU - M Hordvik TI - Spinal ankylosing spondylitis: a variant form of ankylosing spondylitis or a distinct disease entity? AID - 10.1136/ard.44.6.368 DP - 1985 Jun 01 TA - Annals of the Rheumatic Diseases PG - 368--371 VI - 44 IP - 6 4099 - http://ard.bmj.com/content/44/6/368.short 4100 - http://ard.bmj.com/content/44/6/368.full SO - Ann Rheum Dis1985 Jun 01; 44 AB - 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.