Figure 1 (A) The exit of the L4 nerve root is clear and obvious, and the herniated disc above does not compress the nerve root. In c2, (B) the exit of the L5 nerve root is just at the plane of the herniated disc, showing ganglion enhancement and nerve root interruption. (C) The herniated disc pushes against the ganglion. (D) The L5 nerve root is simultaneously compressed by the upper disc and pushed by the lower disc. MRI – magnetic resonance imaging; CMRI – coronal magnetic resonance imaging of three-dimensional fast-field echo with water-selective excitation.