Fig. 3

MRI showing no disc herniation on T2-weighted imaging (a L4–5 axial; b L5–S axial), right L5–S foraminal stenosis on T1-weighted imaging (c right sagittal; d central sagittal; e left sagittal), and right CNR (white solid arrow and white outline arrow) on T2-weighted imaging (f–i coronal). The right CNR (white solid arrow) is compressed due to right foraminal stenosis resulting from L5–S disc degeneration. CNR conjoined nerve root; MRI magnetic resonance imaging