Far lateral lumbar disc herniation part 1: Imaging, neurophysiology and clinical features

Figure 3 Schematic axial view. A: Schematic drawing, axial view: Relationship between dural sac and nerve roots of disc herniations in different locations. Blue: preforaminal. Red: intraforaminal. Grey: extraforaminal. The herniation can be combined (e.g. intra/extraformainal, pre/intraforaminal) (adapted from Lofrese); B: Magnetic resonance imaging schematic axial view.