Figure 2

28-year old male patient with suspected early AS (duration of inflammatory back pain 7 months, BASDAI 3.7, BASDAI 2 5, HLA B27 positive). Coronal (left) and sagittal (right) STIR images show the most commonly seen signal abnormalities in suspected early AS. Inflammatory changes (open arrows) are seen in the lower aspects of the SI joints and subtle abnormalities in the anterior corner of the endplates in the thoracic spine (arrows).