PMC3881508_01
(a) Plain sacroiliac joint X-ray showing irregularities in each joint space (apparent in the right). (b) Evident bone marrow edema area in right side on sacroiliac magnetic resonance (MR) (yellow arrow).
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fig1
Despite the fact that the X-ray was inconclusive (Figure 1(a)), we planned sacroiliac MR and HLA-B27. T2A signals and contrast enhancement (Figure 1(b)) was detected. This was interpreted as indicating acute sacroiliitis.