A patient came to the consultation complaining of pain in the lumbar region radiating along the posterior surface of the right lower limb. An X-ray report on an MRI examination of the lumbar spine by a radiologist described a left-sided herniated disc. Visual examination of the MRI scans shows that the herniation originates from the left segment of the intervertebral disc, and then spreads obliquely down and to the right with moderate compression of the right S1 root.