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Figure 2: (a) Coronal short tau inversion recovery image showing a significant regression of altered signal intensity in right-sided piriformis muscle. Mild to moderate regression is seen in right sacral and iliac marrow involvement as compared to previous magnetic resonance imaging scan. (b) Axial T1-weight postcontrast image with fat suppression showing mild to moderate regression in marrow enhancement of right sacroiliac bone along with persistent fluid signal in the right sacroiliac joint space. (c) Axial T1-weight postcontrast image with fat suppression showing near complete regression in the right piriformis muscle involvement

Figure 2: (a) Coronal short tau inversion recovery image showing a significant regression of altered signal intensity in right-sided piriformis muscle. Mild to moderate regression is seen in right sacral and iliac marrow involvement as compared to previous magnetic resonance imaging scan. (b) Axial T1-weight postcontrast image with fat suppression showing mild to moderate regression in marrow enhancement of right sacroiliac bone along with persistent fluid signal in the right sacroiliac joint space. (c) Axial T1-weight postcontrast image with fat suppression showing near complete regression in the right piriformis muscle involvement