Intraradicular Lumbosacral Disc Herniation: A Case Report And Review of the Literature / 대한척추외과학회지

ABSTRACT

Intraradicular disc herniation is a very rare form of disc herniation because the disc should migrate distally and laterally to enter the nerve root sheath. No case has been diagnosed before surgery. We descibe a 72-year-old woman who has an intraradicular disc herniation into the S1 nerve root and summarize the common features of the past reported 12 cases and this one. MRI showed enlarged nerve sleeve simulating root cyst at the S1 body level. At surgery, fusiform swelling of S1 nerve root adhered to anterior structure was seen and root tumor was suspected. Through the incised opening of the root sheath, two pieces of disc fragment were removed and final diagnosis of intraradicular disc herniation was made. Biopsy of extracted frag-ments revealed degenerative collagenous tissue. Patient's symptom was relieved almost immediately after surgery. An unusual form of intraradicular disc herniation is presented with review of the English language literatures.