Intraradicular lumbar disc herniation: report of two cases and review of the literature.

Intraradicular lumbar disc herniation is very rare. The exact mechanism of the dural tear by a herniated disc is not known. Diagnosis of intraradicular lumbar disc herniation is difficult, so that it is rarely suspected preoperatively. This pathological entity may be a factor in the failure of lumbar disc surgery. We present the seventeenth and eighteenth cases of intraradicular lumbar disc herniation. We emphasise its importance and review the literature on intraradicular disc herniation.