Lumbar Intradural disc herniation is most prevalent in the fifth decade of life, and the overwhelming majority of cases, 76%, occur in males.
Fifty-five percent of lumbar IDH occur at L4–L5, compared to 16% at L3–L4 and 10% at L5–S1; far fewer occur at L2–L3 and L1–L2.4,6 Patients typically present with an acute-on-chronic exacerbation of back pain, and may also exhibit symptoms of cauda equina syndrome. Preoperative diagnosis is difficult due to the variable clinical and radiological presentation.
Arnold et al. reported the experience with two cases of lumbar IDH occurring at the L1–L2 intervertebral disk level 1).
see Cauda equina syndrome due to intradural lumbar disc herniation