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. 2015 Dec 16;5:18356. doi: 10.1038/srep18356

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(A) Abnormal blood flow signals were located in the ligamentous portion of the SIJ in the cleft (surrounding the SIJ) between the sacrum and the ilium at a higher level (white arrow); the actual synovial joint was in a deeper location (arrow head). (B) Abnormal signals within and surrounding the SIJ at a lower level (red arrow and white arrow, respectively) were located at the synovialis and the ligamentous portions of the SIJ, respectively. (C) The signal surrounding the SIJ reflects a reduction in resistance on CDUS, perhaps due to enthesitis of the ISL or the PSL. (D) The signal within the SIJ reflects a reduction in resistance on CDUS, which may indicate synovitis of the SIJ.