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Figure 1: (a) Coronal short tau inversion recovery showing right piriformis involvement along with subtle right sacroiliac joint involvement appearing hyperintense as compared to left side. Hyperintense signal is also seen in the right sacroiliac joint space. (b) Axial T1-weight postcontrast image with fat suppression showing right-sided piriformis abscess. (c) Coronal short tau inversion recovery image showing increased hyperintensity of the right sacroiliac joint. Persistent right-sided piriformis involvement is seen. (d) Axial T1-weight postcontrast image with fat suppression showing persistent piriformis abscess with marrow enhancement of visualized right iliac bone

Figure 1: (a) Coronal short tau inversion recovery showing right piriformis involvement along with subtle right sacroiliac joint involvement appearing hyperintense as compared to left side. Hyperintense signal is also seen in the right sacroiliac joint space. (b) Axial T1-weight postcontrast image with fat suppression showing right-sided piriformis abscess. (c) Coronal short tau inversion recovery image showing increased hyperintensity of the right sacroiliac joint. Persistent right-sided piriformis involvement is seen. (d) Axial T1-weight postcontrast image with fat suppression showing persistent piriformis abscess with marrow enhancement of visualized right iliac bone