Dorsal Migration Type Lumbar Disc Herniation with a suspected Extradural Mass: A case Report.

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In recent years, MRI has been increasingly performed and shown to be useful in patients with lumbar spinal disease. We report a patient with dorsal migration type lumabar disc herniation in whom preoperative MRI suggested an extradural mass.A 42-year-old male developed lumbar pain in his left lower limb in January, 1993. In june, he was admitted to hospital due to increased lumbar pain. On admission, his lift SLR test was positive at 60°. Dorsiflexion strength was decreased in the left hallus, and hypesthesia was observed in the S1 region. Lumbar spinal MRI showed extradural low signals at L5-S2, with T1 and isointensity signals with T2 and a mass enfanced in a ring pattern with Gd-DTPA. After laminectomy at L5-S2, a mass the size of the thumb tip was observed immediately below. This mass posteriorly compressed the dura, reaching in a stalk pattern to the L5/S1 space. Histopathological examination showed this mass to be conposed of degenerative exogenous tissue with inflammatory cell infiltration.
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