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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.
