PMC5843966_01
PMC5843966_02
A woman with lower back pain and unilateral radicular symptoms down the posterior right leg. Image (a-d) demonstrates magnetic resonance imaging T1-weighted, axial images of the pelvis, obtained at an oblique angle in respect to the sciatic nerve. (a) At the level of the pelvis, the abnormal sciatic nerve bifurcation begins to come into view (green arrow). (b) At the next oblique level, definitive split morphology of the sciatic nerve is visualized (yellow arrows). (c) Subsequent slice demonstrates the aberrant sciatic slip coursing through the split piriformis bellies (red arrows). (d) Final sequential image redemonstrates the split piriformis morphology (P) with re-joining of the two nerve segments (S).
JCIS-8-6-g002.jpg
PMC5843966_02_JCIS-8-6-g002.jpg
F1
MRI demonstrated a piriformis muscle with split morphology and a posterior aberrant slip of the sciatic nerve that coursed through the split muscle bellies [Figure 1].