PMC5499956_01
CT of the SIJ (120 kV, 280 mA) shows bone erosion of the left SIJ.. Abbreviations: CT, computed tomography; SIJ, sacroiliac joint.
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CT of the SIJ showed bone erosion of the left SIJ (Figure 1).
MRI of SIJ: (A) axial STIR sequence (TR 2500, TE 35) shows the hyperintense signal of left SIJ (arrow); (B) axial T1-weighted sequence (TR 450, TE 21) shows the hypointense signal of left SIJ; (C) DWI (TR 2000, TE 70) shows the hyperintense signal of left SIJ with edge blurring.. Abbreviations: DWI, diffusion-weighted imaging; MRI, magnetic resonance imaging; SIJ, sacroiliac joint; STIR, short tau inversion recovery; TR, repetition time; TE, echo time.
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Diffusion-weighted imaging (DWI) showed the hyperintense signal of the left SIJ with edge blurring, mainly indicating the sacroiliitis (Figure 2).
(A) Polarized microscopy revealed the urate acid crystals (arrow). (B) Histopathology of puncture objects did not show the tophus formation.
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He underwent CT-guided percutaneous biopsy of the left SIJ, and monosodium urate (MSU) crystals were shown by polarized microscopy (Figure 3A), although histopathology of the puncture objects did not indicate tophus formation (Figure 3B).
PMC5499956_02
MRI of the SIJ: (A) axial T1-weighted sequence (TR 429, TE 12) shows the hypointense signal of the left side of the sacrum and ilium; (B) axial STIR sequence (TR 2400, TE 35): multiple bone marrow lesions, which appeared as edema involving the left side of the sacrum and ilium.. Abbreviations: MRI, magnetic resonance imaging; SIJ, sacroiliac joint; STIR, short tau inversion recovery; TR, repetition time; TE, echo time.
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The corresponding T1-weighted MRI showed hypointense signal of the left side of the sacrum and ilium (Figure 4).
CT of the SIJ (120 kV, 280 mA) shows bone erosion of the bilateral SIJ and pseudo-widening of the left SIJ.. Abbreviations: CT, computed tomography; SIJ, sacroiliac joint.
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CT of the SIJ showed bone erosion of the bilateral SIJ (Figure 5).