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Figure 1: (a and b) Axial T1-weighted MR image of sacrum shows accessory fibers of right piriformis muscle (arrow) crossing over sacral foramen (arrowhead) containing sacral nerve. Accessory fibers of right piriformis muscle are of normal signal intensity. (c and d) Axial STIR images showing edema in right sciatic nerve (arrow) and right gluteal muscle. (e and f) Coronal STIR images showing edema in right sciatic nerve (white arrow) and right gluteal muscle (black arrow in e, arrowhead in f). Anomalous right piriformis muscle (arrowhead in e) seen

Figure 1: (a and b) Axial T1-weighted MR image of sacrum shows accessory fibers of right piriformis muscle (arrow) crossing over sacral foramen (arrowhead) containing sacral nerve. Accessory fibers of right piriformis muscle are of normal signal intensity. (c and d) Axial STIR images showing edema in right sciatic nerve (arrow) and right gluteal muscle. (e and f) Coronal STIR images showing edema in right sciatic nerve (white arrow) and right gluteal muscle (black arrow in e, arrowhead in f). Anomalous right piriformis muscle (arrowhead in e) seen