摘要To the editor:A 55-year-old woman was admitted to orthopaedics department in our hospital with a 3-month history of severe low backache and difficulty in walking in June 2010.Physical examination revealed restricted lumbar spine movement with marked tendemess of lumbar region,but no other joint and extra-articular abnormal features.Blood analysis revealed normal white blood cell count and elevated erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP),pure protein derivative and rheumatoid factor and antinuclear antibody were all negative,T-spot.Tuberculosis (TB) and human leukocyte antigen-B27 were positive,MRI showed normal sacroiliac joint and discitis at L1/2 (Figure 1A).The patient had no a history of other diseases including TB before the start of symptoms except a positive family history of spondyoarthropathy.