Fig. 4

a Selective radiculography of the left L5 spinal nerve. b–e Computed tomographic scans of the coronal section. The asterisks indicate the two left pedicles of the fused L5 vertebra. c The white arrowheads show the left L5 spinal nerve pinched between the transverse process and sacral alar. e The white arrow indicates a unique foremen “like a bony tunnel” through which the left L5 spinal nerve emerges